GIS Data Conversion

Hey guys, in this post we are going to focus on one of the important topic of GIS world, which is the “DATA CONVERSION”. Data Conversion means converting computer data into another format. With huge amounts of GIS data available for use, it is more cost-efficient and effective to convert the GIS data from one format to another than recreating all of it.

GIS Data Conversion

There are many ways to convert GIS data and the conversion may use special conversion programs. Simply, it may involve complex data exporting or importing procedures. As we  know there are many data file formats used in GIS, this time we will be converting them from one format to another.

To get the list of the various data file formats you can visit our previous posts.

Vector data file formats in GIS and Raster data file formats in GIS.

To make datasets usable together in GIS, it is necessary to convert the both vector and raster geospatial file from one format to another. And for doing the Conversion we already have posts about the data conversion from GeoJSON to Shapefile and KML to shapefile and many more, but they all have a long way to convert the GIS data. The Alternative to that is some free and commercial converter  software or tools available on the web. There are a Lots’s of tools available on the web, but I recommend you to use  IGisMap converter.  IGisMAP Converter is an online tool to convert GIS data from one format to another format.

IGisMap converter provides On-line conversion and transformation of both vector and raster geospatial data.  In this on-line converter tool the uploaded data file is allowed to convert into various GIS data format.

IGisMAP converter can convert bulk amount of data into another format using any coordinates reference systems. And then you can download the converted data or store it into MyMapData.

This all about IGisMap Converter tool hope it will make your spatial study easy. If you face any problem in data conversion then please comment or chat with us.

Futhermore, You can also check :

Download Singapore Administrative Boundary Shapefiles – Regions, Community Development Councils, Electoral Boundaries and more

Hello GIS enthusiasts, IGISMAP has now published the latest GIS vector data of Singapore administrative levels. Links for downloading the shapefiles of the important administrative divisions of Singapore are provided in the following. You can also download these data in KML, GeoJSON or CSV formats. 


  • All data available are in GCS datum EPSG:4326 WGS84 CRS (Coordinate Reference System).
  • You need to login for downloading the shapefile.

Download Free Shapefile Data of Singapore

Singapore, officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude (137 kilometers or 85 miles) north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south, the South China Sea to the east and the Straits of Johor to the north. The country’s territory is composed of one main island, 63 satellite islands and islets, and one outlying islet, the combined area of which has increased by 25% since the country’s independence as a result of extensive land reclamation projects. It has the third highest population density in the world.

Singapore National Boundary
Singapore National Boundary

Download Singapore National Outline Boundary Shapefile

Download Singapore Regions Shapefile Data

The regions of Singapore are urban planning subdivisions demarcated by the Urban Redevelopment Authority of Singapore to aid in its planning efforts. Over time, other governmental organizations have also adopted the five regions in their administrative work. These regions are:

  • West Region
  • North Region
  • North East Region
  • East Region
  • Central Region
Singapore Region Boundary
Singapore Region Boundary

Download Singapore Region Boundaries Shapefile

Download Singapore Community Development Councils Shapefile Data

The Community Development Council or CDC is a government-led program to organize grassroot organizations and community programs into smaller, local units as a bridge between the government and the community in Singapore. It encourages volunteerism from wider community, and organizes community and social assistance programs with the help of a monetary grant from the government.

In 2001, the 9 districts and CDCs were then reformed into 5 CDCs, namely:

  • North East CDC
  • North West CDC
  • South East CDC
  • South West CDC
  • Central Singapore CDC
Singapore CDC Boundaries
Singapore CDC Boundaries

Download Singapore CDC Boundaries Shapefile

Other Administrative Boundaries GIS Data:

You can also do Query on this shapefile (GIS Data) using IGIS Map Tool

Download Free Shapefile for the following:

  1. World Countries Shapefile
  2. Australia
  3. Argentina
  4. Austria
  5. Belgium
  6. Brazil
  7. Canada
  8. Denmark
  9. Fiji
  10. Finland
  11. Germany
  12. Greece
  13. India
  14. Indonesia
  15. Ireland
  16. Italy
  17. Japan
  18. Kenya
  19. Lebanon
  20. Madagascar
  21. Malaysia
  22. Mexico
  23. Mongolia
  24. Netherlands
  25. New Zealand
  26. Nigeria
  27. Papua New Guinea
  28. Philippines
  29. Poland
  30. Russia
  31. Singapore
  32. South Africa
  33. South Korea
  34. Spain
  35. Switzerland
  36. Tunisia
  37. United Kingdom Shapefile
  38. United States of America
  39. Vietnam
  40. Croatia
  41. Chile
  42. Norway

Disclaimer : If you find any shapefile data of country provided is in correct do contact us or comment below, so that we will correct the same in our system.

Query GIS Data – IGIS Map Tool

To Query GIS Data easily with IGIS map tool, we can use the Query tool.  A GIS query tool, or selection tool as it is often know, allows us to filter a dataset based on criteria that we define.

Querying in IGIS Map Tool allows user to explore your data with rule based queries. User can discover their features of interest contained within the map by querying. IGIS Map tool allow users to build their own queries that we may not have envisaged when we first created the map. It also query GIS data according to their choice.

Query GIS Data – IGIS Map Tool

Query tools allow maps users to do more than what the map maker envisioned when they styled the layers. Here are the few steps to be followed for querying the map.

Query GIS data

  • Upload dataset and create a new map project Or Open your existing map project.
  • Or Download GIS data for analysis

Query GIS Data


  • Select the “Query tool” option on the Analysis Section.

  • Select the Layer to query GIS data.

Query GIS Data

All the layers in your map are available in this section, you just need to select the layer in which you want to query in.

  • Confirm a shape i.e. circle , rectangle or polygon to draw a query.


User just need to select the shape and start drawing the shape on the map to query the data. similarly as above image shows the queried data as highlighted which is queried by a rectangle.

  • Click on the Get result button after drawing the shape. You can view the result in as tables and also download them as CSV Format.

Query GIS Data

This is how you can Query GIS Data with the IGIS Map Tool in a minute. Query tools allow maps users to do more than what the map maker envisioned when they styled the layers.

IGIS Map Query Tool can be used in various sectors like Insurance, Banking, Risk Management etc. There are also other query tools available in the market.  IGIS map tool however, is a much better choice to Query GIS Data if you want to share your maps with a larger, more distributed audience.

This may help you to Query GIS Data with IGIS Map Tool. If you find any problem in creating one such example do let us know by commenting below.


Convert CSV to KML

Hello guys,  If you are looking for converting your CSV file into KML, you have landed on the right place. Here in this article we are discussing on how to convert CSV to KML in the easiest way possible.

A comma-separated values (CSV) file is a delimited text file that uses a comma to separate values. Each line of the file is a data record. KML or Keyhole Markup Language is a collection of geospatial data on map and commonly used in Google Earth or google services

Using IGIS Map Tool you can easily convert – CSV to KML . You can also do other GIS Data Conversion using this tool.

IGISMAP to Convert CSV to KML

For CSV to KML conversion go to IGIS Map Tool, after logging in with your registered email and password. If you are a new user, click the Sign Up button in the Login popup and register to IGISMAP by filling the details.


There are three main steps for using GIS Converter:

  • Click on Tool Converter
  • Upload the data
  • Choose the format to which it should be converted

Step one is to upload your CSV file which you want to convert. You can upload the file from your system or select from the Recent Files.


  • Input CSV file should have location information in WKT format under a field named as WKT.
  • Input CSV file should not have any columns with empty column name between other fields.
  • Well Known Text (WKT) is an Open Geospatial Consortium (OGC) standard that is used to represent spatial data in a textual format.
  • WKT format represents a geometry with the name of the vector entity ie., POINT, POLYGON or LINESTRING followed by the longitude and latitude of the point feature or the vertex of the polygon in brackets. Example for each entity is given below
    • POINT (169.03934 -46.32844)
    • POLYGON ((76.61103048 9.85276413,76.612068 9.85303305,76.6124496 9.85362534,76.61269368 9.85513401,76.61374668 9.85455036,76.61466216 9.85409739,76.61630232 9.85377888))
    • LINESTRING (-123.031531560501 40.4178012488507,-122.889863902657 39.8410114990573,-122.464860929125 38.7886231836447,-121.311281429538 37.473137789379)
  • Name of the field ‘WKT’ is not necessary to be case sensitive.
Upload CSV

Here we have uploaded the CSV file containing the locations of counties of Washington. It contains locations recorded in WKT format as follows:

CSV data with WKT field

Step two is to select choose the output format of the converted file, in this case its KML. You can also set the Coordinate Reference System of your preference. As a default CRS will set to WGS 84 (World) [EPSG:4326]. Click on the Convert File.

Select KML as Output Format
Select KML as Output Format

Your CSV file will then get converted to KML file after a few seconds and will be available for downloading.

Download and Publish KML File

You can also choose to style the layer or continue with further conversion process by clicking the Convert Another File button.

Converted Files section from the dashboard contains the list of the details of all the conversion done in your account, providing both input and output data available for download their corresponding formats.

You can also search locations, add new datasets, edit layers and style the map according to your choice and requirements. As IGIS Map Converter Tool provides many benefits other then just conversion of data. This tool provides us to generate this published map in PDF or as image format.

Other GIS data Conversions

If you are facing any problem in conversion or login then please let us know by mailing at or drop comment.

Introduction of QGIS 3.4.4 for beginners

Quantum Geographical Information System is a open source platform for viewing, editing, managing and analysis of spatial data with various features which makes your analysis better. As we need word processor to deal with words similar to this for spatial information we require GIS application. In this blog I am providing Introduction of QGIS 3.4.4 for beginners. QGIS 3.2.1 ‘Bonn’ is released on 20 July 2018. QGIS 3.6.2 is the current version but its functionality is same as QGIS 3.4.4.  With the help of QGIS you can also create Interactive Web Map. 

Want to convert Shapefile into KML in QGIS 

QGIS supports both flavours of GIS datasets i.e Vector data formats and Raster data formats.

Download QGIS

You can also create map without using QGIS Click


QGIS 3.4.4 Interface or GUI

With the current version QGIS 3.2.1 many new features are added. Here we approach its feature one by one. You can also check How to open and view vector data in QGIS 3.4.4

QGIS desktop screen

Introduction of QGIS 3.2.1 for beginners
Introduction of QGIS 3.2.1 for beginners

Components of GUI

Main area of QGIS is called as canvas. Likewise other GIS applications toolbars, panels, status bar and menu bar is also. Lets start its study in brief.

Introduction of QGIS 3.2.1 for beginners

1. Menu Bar –

In the above image 1 number is showing main menu bar. You can access almost everything of QGIS from main menu. You can use various features and functions of the QGIS menu style. The Main Menu cannot be moved unlike the toolbars and panels.

2. Toolbar –

Toolbars have buttons that provide a one click access (i.e. shortcuts) to many of the features and functions found in the Main Menu. Toolbars are movable and free floating.

3. Canvas or Map Display Panel –

It shows geographic display of GIS layer or panel layers. It covers maximum area off course because of its function. Create a Basic Map on canvas

4. Browser Panel –

It provides a list of files on your computer. You can drag and drop GIS files into the Layers Panels to view them. This panel is movable and can be hidden/shown on the GUI. We can display it by right click at tool bar and choose the panels you want to use.

5. Layer Panel –

This panel shows map layers that are in your current project. Layers can be turned on/off, clubbed , change drawing order, etc. Extract or Select features in Layer.

6. Status Bar –

It display all the relevant information about the current project. It  shows the current scale of the map display, coordinates of the current mouse cursor position,and the coordinate reference system (CRS) of the project.

Now, you get familiar with QGIS interface, how it works, what is the need. Hope this post is beneficial for amateur GIS professional. If you face any problem in downloading QGIS and in using QGIS 3.2.1 desktop drop you comments. Any suggestions are welcome.

Furthermore,  you can also check QGIS Server – Configuration and Deploying QGIS Project , QGIS Servr – Installation in Ubuntu

QGIS Tutorial:



SHP to GML – Convert Shapefile to Geography Markup Language

Shape file shp to GML conversion is required when you carry data from one place to another. Shapefiles are heavy as compared with GML (Geography Markup Language). On the other hand we can say that GML makes you able to do many of the same things that you would do with heavyweight desktop GIS files.

For a more in-depth guide on this topic, be sure to check out our accompanying video tutorial, where we walk you through each step visually and provide practical demonstrations.

Convert SHP to KML using IGIS Map Tool

GML (Geography Markup Language) is about describing kinds of geographic objects. This is XML based language that contain two part- the schema that describes the document and the instance document that contains the actual data. GML schema allows users and developers to describe generic geographic data sets that contain points, lines and polygons. Using this schema user can differentiate between geometry primitives.

GMl format composed of geometry property and attribute detail in feature member tag. Here geometry defines which primitive is available in data. Whether it is point, line or polygon. These can be multilinestring or multipolygon. The given line of GMl defines the lineString, contains attributes as MED_DESCRI, RTT_DESCRI, F_CODE_DES, ISO and ISO_country in ogr tag. The srsName(Spatial reference system name) is given is file for each geometry as EPSG number.

LineString as Example of GML file Describing feature – Know Before performing shp to gml convert

 <ogr:India_raods fid="India_raods.0">
 <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>77.8277403974823,35.5012774951288 77.8257523064861,35.4995003281321</gml:coordinates></gml:LineString></ogr:geometryProperty>
 <ogr:MED_DESCRI>Without Median</ogr:MED_DESCRI>
 <ogr:RTT_DESCRI>Secondary Route</ogr:RTT_DESCRI>

This also contains the bounding box of whole data with four corner latitude longitude.


Convert shapefile Shp to GML (Geography Markup Language) using Ogr2Ogr –

For converting shapefile in GML format you need to have ogr2ogr utility in your system. If this is not available you can follow the given procedure.

Convert Shapefile shp to GML - Geography Markup Language
Convert Shapefile shp to GML – Geography Markup Language

After installing, you can check the availability of ogr2ogr in terminal by typing ogr2ogr, then you will be able to see the following result.

Convert- Shape file to GML

Command Line conversion – shp to gml-

Now, to convert Shapefile to GML you need to execute the following command-

Convert- Shape file to GML

In this command -f is the output file format i.e. GML then specify the output file name with .gml extension and after that input shapefile name with .shp extension.
Note- while executing this command you must check for .shx file, which contains the positional index for geometry objects.

Code- Convert shp to GML

If you want the conversion using programing or don’t want to use terminal then this can also be done using PHP. You can create a function that defined this command as string and can give this string in shell_exec() method to execute. Shell_exec() actually execute the command and returns output as string.

public function shptogml($shpfilepath,$output){
$query=”ogr2ogr -f GML $output.gml $shpfilepath”;

The GML output file will be something like this-

Convert Shapefile shp to GML - Geography Markup Language

Change coordinate system of GML file from shp-

Many of times, we need the output file in other coordinate system. For this we can use options of ogr2ogr utility. It has

-t_srs srs_def:

Reproject/transform to this SRS on output

-s_srs srs_def:

Override source SRS

So using these option, we can get the data in required coordinate system. So for this you can write the query as-

–> ogr2ogr -f GML -t_srs EPSG:32643 (new EPSG) -s_srs EPSG:4326 (old EPSG) newGmlFile.gml InputFile.shp

You also can visit Shapefile to GeoJSON, Shapefile to KML, Shapefile to TopoJSON, Shapfile to geopackage etc.

If you face any problem during implementing this tutorial, please let us know. Feel free to comment in given comment box.

SHP to GPX / GPS – Convert Shapefile to Global Positioning System

Shapefile shp can be converted into GPS ( Global Positioning System) using ogr2ogr utility. The GPS data is best option when routes and tracks are required in XML format. Here we will check how to convert shapefile shp to GPX / GPS.

Convert Shp to GPX – Using IGIS Map Tool

Go to Igis Map Conversion Tool . Login with registered id and password or if you are new then register with valid email id. Then tap on Switch To button select conversion in the drop down list.

Upload your file from system or drive or from drop box. After uploading the file choose the output format. And in the last click on Convert File button. You will be directed to the map where converted file is published.

Download the converted SHP to GPX file from the download icon. For detailed conversion watch the video provided below.

Details for GPX/GPS (GPS Exchange Format) and Shapefile Format Before Converting Shapefile to GPX GPS data-

GPX (GPS Exchange Format) is a light-weight XML data format for the interchange of GPS data (waypoints, routes, and tracks) between applications and Web services on the Internet. Shapefile is collection of geometry with attributes mainly comprised of three files .shp for which stores geometry, .shx which stores index and .dbf which stores data of respective attributes.

The example is given below for linestring feature of gpx version. Here metadata contains the bounding box with min (lat,long) and max (lat, long). The tag trk defines the tracks, which contains extension tag, trkseg tag and trkpt tag. Here extension tag contains all the attributes in ogr tag with values. Trkseg tag is the track segment, which is composed of track points with latitude longitude.

<gpx version=”1.1″ creator=”GDAL 2.2.2″ xmlns:xsi=”” xmlns:ogr=”” xmlns=”″ xsi:schemaLocation=””>
<metadata><bounds minlat=”7.925284332688660″ minlon=”68.498222433926088″ maxlat=”35.501281464128759″ maxlon=”97.334792107009250″/></metadata>
<ogr:MED_DESCRI>Without Median</ogr:MED_DESCRI>
<ogr:RTT_DESCRI>Secondary Route</ogr:RTT_DESCRI>
<trkpt lat=”35.501277495128768″ lon=”77.82774039748233″>
<trkpt lat=”35.499500328132093″ lon=”77.825752306486052″>

Convert- Shapefile shp to GPX / GPS- Global Positioning System

Convert shp to GPX /GPS using ogr2ogr utility-

Ogr2ogr utility has some options some of them are give below,


Dataset creation option (format specific)

-nlt type:


-f option:



By default, the GPX driver will discard attribute fields that do not match the GPX XML definition (name, cmt, etc.).

If GPX_USE_EXTENSIONS=YES is specified, extra fields will be written inside the <extensions> tag.

–> ogr2ogr -f “GPX” -dsco GPX_USE_EXTENSIONS=YES output_gpx.gpx India_raods.shp -nlt MULTILINESTRING

If you don’t have ogr2ogr utility in your system please execute the given commands to install ogr2ogr,

Convert- shp to gpx

Check the presence of utility by typing ogr2ogr in command prompt-

Convert- shp to gpx

Code to Convert GPX GPS from Shp

The conversion thing can be done in PHP using shell_exec() method, given below-

public function shptogpx ($shpfilepath,$output,$type) {
$query=”ogr2ogr -f GPX -dsco GPX_USE_EXTENSIONS=YES $output.gps $shpfilepath.shp -nlt $type”;

Convert- shp to gpx

Change coordinate system of GPS/GPX file-

Changing coordinate system using ogr2ogr is a one of the simple task. It has various option, here two are given, which will help to convert the coordinate system into desired one.

-t_srs srs_def:

Reproject/transform to this SRS on output

-s_srs srs_def:

Override source SRS

So using these option, we can get the data in required coordinate system. So for this you can write the query as-

–> ogr2ogr -f GPX -t_srs EPSG:32643 (new EPSG) -s_srs EPSG:4326 (old EPSG) -dsco GPX_USE_EXTENSIONS=YES newGPX_File.gpx  InputFile.shp -nlt MULTILINESTRING

You also can visit Shapefile to GeoJSON, Shapefile to KML, Shapefile to TopoJSON, Shapfile to geopackage, Shapefile to MapInfoFile etc.

If you find any problem during implementing this tutorial, please let us know. Feel free to comment in given comment box.

Formula to Find Bearing or Heading angle between two points: Latitude Longitude

Formula to Find Bearing or Heading angle between two points. Bearing or heading angle is used to define navigation generally in the field of aircraft or marine or Vehicle navigation or while working for land surveying. So what’s the heading or bearing? How we can find bearing between the two points on earth, with the formula? Or How we can find the other point, when one point, actual traveled distance and bearing is given? Let us discuss all this points, followed with the example and experiment with the tool for calculating bearing provided in the post.

Formula to Find Bearing or Heading angle between two points: Latitude Longitude
Formula to Find Bearing or Heading angle between two points: Latitude Longitude

Bearing can be defined as direction or an angle, between the north-south line of earth or meridian and the line connecting the target and the reference point. While Heading is an angle or direction where you are currently navigating in.  This means to reach a particular destination you need to adjust your heading direction with the bearing. Generally a ‘compass’ is an instrument, which gives you the direction information for navigation. You must refer Haversine distance formula before going through this post.

Calculating Bearing or Heading angle between two points:

So if you are from GIS field or dealing with GIS application, you should know bearing and how to calculate bearing with formula. Let us look on formula and tool for bearing:

  • Let ‘R’ be the radius of Earth,
  • L’ be the longitude,
  • ‘θ’ be latitude,
  • β‘ be Bearing.

Denote point A and B as two different points, where ‘La’ is point A longitude and ‘θa’ is point A latitude, similarly assume for point B. Bearing would be measured from North direction i.e 0° bearing means North, 90° bearing is East, 180° bearing is measured to be South, and 270° to be West.

Note: If bearing is denoted with +ve or –ve initials whose values lies between 0° to 180°, then –ve is denoted for South and West sides.

Formula to find Bearing, when two different points latitude, longitude is given:

Bearing from point A to B, can be calculated as,

β = atan2(X,Y),

where, X and Y are two quantities and can be calculated as:

X = cos θb * sin ∆L

Y = cos θa * sin θb – sin θa * cos θb * cos ∆L

Lets us take an example to calculate bearing between the two different points with the formula:

  • Kansas City: 39.099912, -94.581213
  • St Louis: 38.627089, -90.200203

So X and Y can be calculated as,

X =  cos(38.627089) * sin(4.38101)

X  = 0.05967668696


Y = cos(39.099912) * sin(38.627089) – sin(39.099912) * cos(38.627089) * cos(4.38101)

Y = 0.77604737571 * 0.62424902378 – 0.6306746155 * 0.78122541965 * 0.99707812506

 Y = -0.00681261948

***Convert θ into radians***

So as, β = atan2(X,Y) = atan2(0.05967668696, -0.00681261948) = 1.684463062558 radians

convert it into degree

           β = 96.51°

This means, from Kansas City if we move in 96.51° bearing direction, we will reach St Louis.

You can also check video explanation of bearing angle.

Tool to find bearing angle between two lat lon points:

Check out the following IGISMap tools to work with Bearing Angle

IGISMap Bearing Angle Tool

IGISMap is a GIS based web platform providing multiple GIS applications that are most important in the field of geospatial analytics. The peculiarity of IGISMAP in the GIS Industry is its UI/UX that helps the user to perform effortless geospatial operations.

Bearing Angle tool of IGISMap can be used to create geospatial path based on bearing angle, distance and location. A path will be one or more straight lines connected between points plotted in order. User can plot required locations by simply clicking on the map or by entering address or coordinates. The path created in Bearing Angle will be available as GIS layer in the IGISMap. This GIS layer can be downloaded as GIS data in any format such as Shapefile, GeoJSON, CSV or KML.

Check to open Bearing Angle

Formula to find a lat lon point, when bearing, distance and another lat lon is given

Let us assume a condition, where you want to find out the where will an Airplane will land up, if you have following details of that Airplane, i.e actual distance it will travel, the bearing and the starting point (lat,lon)?

  • Let first point latitude be la1,
  • longitude as lo1,
  • d be distance,
  • R as radius of Earth,
  • Ad be the angular distance i.e d/R and
  • θ be the bearing,

Here is the formula to find the second point, when first point, bearing and distance is known:

  • latitude of second point = la2 =  asin(sin la1 * cos Ad  + cos la1 * sin Ad * cos θ), and
  • longitude  of second point = lo2 = lo1 + atan2(sin θ * sin Ad * cos la1 , cos Ad – sin la1 * sin la2)

You may find both the tool on separate page, with Google map working on it: (It will be update in 2 days, please visit us again)

  • Tool to Find Bearing, when two points are given
  • Tool to find other point, when bearing, distance and one of the point is given.

I hope this article will definitely help you, to find the bearing or heading. You are free to share more data related to bearing or any thing that you uses to calculate bearing and how you use navigation with bearing.

If you find anything difficulty to understand the bearing calculation, you may comment below, so that we will discuss further on finding bearing or heading angle.

Sign up and login to IGISMap Tool to check more GIS tools.

Now we are on Youtube also. Please Like, Share and Subscribe our Channel IGIS Map

How to remove gaps from a polygon layer file in ArcGIS?

How to remove gaps from a polygon layer file in ArcGIS? While preparing polygon layer file following various stages of layer preparation like

This is what making it suitable to be used by a web application as an input. While layer file should be accurate with minimum error before deploying or issuing the same to the client, which requires lots of time to make.  Obviously no client for project submission will tolerate the delay and so this task time is to be reduced. So this blog post will deal with, how reduce time duration of preparing a layer file?

If you are new to ArcGIS, I recommend you to Look for  FAQ  and Interview of ArcGIS Tutorial.

Remove gaps from a polygon layer file in ArcGIS:

This is quite possible by using ArcGIS inbuilt tools and this can be accomplished by understanding the need and using appropriate tool. A number of errors are generated at various stages of layer preparation like gap in a feature, overlap with other feature, self over and many more. These errors can be detected by selection tool or by running topology rules for every layer. But the question is removal of these errors. If there are just a hundred of polygons in layer one can remove it manually zooming on to every gap and overlap. But if there are a million or more number of polygons in a layer for example if a village has 1000 parcel on an average in a district of 600 villages, the total number of parcel in a district comes out to be 6 lakh. It takes almost equal time in preparing an error free file as much time used for preparing the layer file.

For this one task i.e. removal of gaps in a feature can be made easy and can be performed in less time by the use of a tool named Eliminate present in the Data Management toolset of ArcGIS.

Steps to remove gaps from a polygon layer file in ArcGIS

remove gaps from a polygon layer file in ArcGIS
Detection of Gaps in the polygon File


1.) First all gaps in a layer file should be converted to polygons using auto complete polygon tool from the editor bar.

remove gaps from a polygon layer file in ArcGIS: Forming polygons from gaps using Auto-complete tool
Forming polygons from gaps using Auto-complete tool

2.) Then these polygons should be copied to layer file.

remove gaps from a polygon layer file in ArcGIS: Copying gap polygon to main file.
Copying gap polygon to main file.

3.) Selecting all gaps in the form of polygon apply eliminate tool from data management toolset on the layer file.

remove gaps from a polygon layer file in ArcGIS: Applying Eliminate tool on the polygon file to remove gaps.
Applying Eliminate tool on the polygon file to remove gaps.

4.) The gaps are merged with the neighboring polygon having larger area or longer shared border.

In this way the work of one month can be reduced to one week or lesser. This tool should be used for removal of small gaps only. As for larger gaps the decision of merging the gap polygon in which neighboring polygon should be done by visual interpretation and analytically perspective.

If you are dealing with Raster files with ArcGIS and with multispectral band files, you may look for Pan-sharpening image using ArcGIS.

Hope this tutorial would help you to remove gaps from a layer file in ArcGIS.  While I always works in Open Source tool in GIS, I would like to make you check the QGIS and QGIS tutorials.

If you are facing any problem related to the above, then do comment below, we would look for the problem and suggestion for the same.