How to style the point GIS data categorically

GIS helps users to understand patterns, relationships and geographic context. It benefit includes improved communication and efficiency, as well as improved management and decision-making. GIS combines datasets with maps, integrated regional datasets with any type of descriptive information or data. It provides mapping and assessment prerequisites for technology and almost every industry.

Visualization and intepretaion of data is what makes GIS a beautiful and interesting fields in data analytics. Science of visualization is the core essence in the art of cartography and mapping. Any type of geospatial features presented in the map with proper color combination, accurate size and location helps in better image interpretation. Quantity and category based representation of spatial features are the common visualization styles used in GIS.

IGISMap Styling Tools

IGISMap is a 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. IGISMap provides the following styling tools:

  • Basic Style
  • Category Style
  • Quantity Style
  • Bubble Style
  • Icon Style

Among the styling options listed above, Bubble Style and Icon Style are used to symboloze point GIS data, whereas Basic, Category and Quantity styling options are used to style polygon and polyline GIS data. Bubble Style is used to style the point GIS data quantitatively and Icon Style is used to style point GIS data with the icon or categorically by assigning separate icon for each categories.

In this article, we will talk about how to categorically represent point GIS data using Icon Style tool of IGISMap and will walk through the steps to style your data categorically like the following

Administrative Locations in London
Administrative Locations in London

Uploading the data

For the demonstration, we will upload the point GIS data of administrative buildings locations in London city and categorize it based on types. First lets upload this data using Upload Vector File tool of IGISMap.

After opening the Upload Vector File tool, here we can upload required the vector data in any of the following vector formats.

GML, KML, KMZ, GeoJSON, TopoJSON, GPX, GPS, GPKG, ODS, MAPINFO, SOLITE, ESRI SHAPEFILE DXF MID. MIF, PDF

Upload Vector File tool
Upload Vector File

In the Select Layer section we have to click on Browse and select the input file from the system, which is the GIS data of administrative building locations in Lonndon named as London_admins. After opening the file, click Upload.

Upload Vector File - Select Layer
Uploading the file

After uploading, input GIS data will be visible on the IGISMap screen, represented by default icon style as shown below.

Upload Vector File - Point GIS Data
Point GIS Data plotted on map

Styling the point data categorically

After adding the input GIS data, we can style the points categorically using Icon Style tool. For accessing the tool, click Tools button at the upper left side of screen to open the map tools popup. Then select Icon Style tool listed under Style Your Data section.

Map Tools popup
Map Tools

We can also open the Icon Style tool by going to the More option of input point data and choose the Icon Style from the Edit Style option.

IGISMap More options
More options

Styling point GIS data categorically

After appearing the tool, we have to select the layer from Select Layer section which is the London_admins data that is published in this map and then we have to click Next option.

Icon Style - Select Layer
Select Layer

After that Edit Layer section is appeared. Here we have to choose Category Icon. Now in the Attribute field, select admin field to categorize the point data based on its individual attributes values. You can also assign a default icons size to applied for every icon style in the Set Market Size box.

Select the Attribute in Category Icon
Icon Style – Category Icon

In the Icon Overlap, you can change the option between True or False. Choose True if you want the icons to be overlapping when the map is zoomed out. Select False if you want to see every point icons any zoom extend of the map.

After selecting the required attribute field, all individual values will be listed with different icons assigned for each category, with default marker size. We can change the icons for each category by selecting the edit option and choosing the right icon from the list provided. We can also assign appropriate marker size for each category at Set Marker Size section.

Setting Icon and Marker Size
Setting Icon and Marker Size

After editing we have to click on Save Style for styling the point data.

Save the Style after Edit Layer
Save the Style after Edit Layer

Following all the process we get the desired output on the screen of IGISMap.

Point Map by Icon Style
Point Map by Icon Style

Create point data and convert it into polygons

Voronoi polygon is an area representing the influence from a particular point location. A Voronoi polygon is actually a systematic way to divide spaces into a number of regions using a set of input points. For each point there will be a corresponding area that consists of the locations closer to that point than any other. These areas are called Voronoi cells.

IGISMap provides a Point to Polygon tool to create Voronoi polygons out of point from input point data. IGISMap is a web platform providing multiple GIS applications that are most important in the field of geospatial analytics. In IGISMap, you can upload your GIS data and perform geospatial analysis.

In IGISMap, Point To Polygon tool will convert input point data into polygon data by creating a polygon shape for each point in the input point data, like the following.

Voronoi Polygon
Voronoi Polygon

Click Point to Polygon to open the tool directly.

Point to polygon

After opening Point to Polygon tool, first step is to add the data using any of the following options:

  • Select
  • Create Points
  • Upload Vector
  • Upload CSV/Excel
  • Add GIS Data
IGISMap Point To Polygon tool
Point to Polygon

Here we are going to choose the option to Create Points and then convert the point to polygons through voronoi conversion. Thus lets first create and publish point GIS data.

Creating point data

Select Create Points tab which open Add Points section to plot points on the map at the desired locations.

Create Points
Create Points

Points can be plotted through any of the following options that can be used anytime in this section. They are:

  • Add Points
  • Search Address
  • Lat Lon Values

After finish the plotting, click Save and Publish button to publish the point GIS data.

Add Points
Add Points

Converting the Point data to Polygon data

After saving the point data, Convert Layer section is appears to carry out the point to polygon process.

Now click Convert button to run the point to polygon process.

Convert the Point Layer
Convert the Point Layer

As you can see, voronoi polygon layer is created and published in the map.

Voronoi Polygon
Voronoi Polygon

Sharing the voronoi polygon map

For sharing this map we have to click on Share Map button from the map. In the Share Map window, you can give the map name at the map title and  click on Next. Then a share map section appears.

Share Map
Share Map

Choose the option between Share Map as a link or Embed Map to get the html iframe to attach in the webpage. Here you can also two security of the map by selecting Public or Private.

Embed Map
Embed Map

Create voronoi polygons from the points plotted from spreadsheet

Voronoi polygon is an area representing the influence from a particular location point. A Voronoi polygon is actually a systematic way to divide spaces into a number of regions using a set of points specified at the beginning. For each point there will be a corresponding region that consists of the points closer to that point than any other. These regions are called Voronoi cells.

IGISMap provides Point to Polygon tool to create polygon from an input point vector data. IGISMap is a 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. In IGISMap, we can upload and download GIS data from IGISMap GIS Data collection and use this data to perform geospatial analysis.

Using Point to Polygon tool, voronoi polygon out of the input point locations can be produced and published a new polygon GIS data. These polygon represents the area of influence from each points of the input point data. Lets look into the process to create voronoi polygon as shown below.

Point to Polygon - Voronoi Polygon Layer
Voronoi Polygon Layer

Click the below link to open Point to Polygon tool directly.

https://map.igismap.com/point-to-polygon

Point To Polygon

After opening Point to Polygon tool, first step is to add the data. There are multiple options to add the data, which are:

  • Select,
  • Create Points,
  • Upload Vector,
  • Upload CSV/Excel,
  • Add GIS Data.
Point to Polygon - Add GIS Data
Add GIS Data

Add GIS Data option will be selected as default, where we can add the required point data from IGISMap GIS data collection.

Upload the point data:

In this article, we will upload and plot the points from the Excel file using Upload CSV/Excel File option. In the Upload CSV/Excel File, browse and select the file from the system, then click Upload. Browse the file with USA state wise population, which is final USA population and then upload it.

Point to Polygon - Upload CSV/Excel
Upload CSV/Excel

Then we have to define the location based on the format which coordinates are stored in your Excel file for each location. Here the location is stored in latitude and longitude values in two separate columns. Choose the columns of the input data from the dropdown and click Publish.

Define Location Fields
Define Location Fields

Converting point data to polygon data

After successfully uploading the input point GIS data, Convert Layer section gets opened. Name of the input data is provided as Active Data. In our case, its final usa population. User can change the active data by clicking the Change layer icon. You can to zoom to the layer using Zoom layer icon.

Now click on the Convert button to create voronoi polygon out of the location points from the input data.

Point to Polygon - Convert Layer
Convert Layer

After successfully converted the polygon layer the output is showed of the screen of IGISMap.

Voronoi Polygons
Voronoi Polygons