To get full source code for this tutorial, click here. To check the live demo for this tutorial, click here. A Polygon with holes have one or more interior boundaries(holes). In order to draw holes in polygon, you have to understand Polygon geometry and it’s representation in OpenLayers. The geometry is stored as array of […]
Draw Holes in OpenLayers Polygon Read More »
When you create a vector layer in OpenLayers, it comes with default styles or when you use Draw or Modify interaction, they also use default styles. OpenLayers style module is use for creating custom style for your vector layers like defining new color, border color, border width, fill color or fill pattern. To get full
Implement Dynamic Styles in OpenLayers Read More »
When using OpenLayers for map drawing or modification, it’s important to know about the snap interaction. This will allow your features (such as roads) line up with other nearby objects when you’re done editing them so that they look nice and tidy instead of jumbled together carelessly like in confuse fashion! Click here to get
Implement Advance Snapping in OpenLayers Read More »
OpenLayers is an powerful map api to develop map based applications. But to perform complex spatial operations like splitting a polygon, merging two polygons etc., we need to find another way to accomplish these operations. OpenLayers can’t do these operations on its own. This tutorial is the extension to following tutorial. If you have not
Split a Polygon with holes by Line in OpenLayers Read More »
ogr2ogr by GDAL project is a command line tool for GIS data processing to “Convert simple features data between different file formats”. It can performs various operations like Converting data between different formats like shapefiles to GeoJSON, GeoJSON to shapefiles etc. Transforming data from one projection to another projection Doing spatial selection on data Exporting
ogr2ogr – A simple command line tool to transform your GIS data. Read More »
The usage of Python in GeoSpatial field has exponentially grown. Almost every GIS desktop software provide python integration. QGIS, famous open source GIS software, has python interface. Python has many open source GIS libraries for example GDAL, Fiona, GeoPandas, RasterIO, Shapely, Xarray Spatial etc. These libraries can process both raster as well as vector data.
Import Shapefile to PostgreSQL/PostGIS database using GeoPandas/Python Read More »
zIndex helps in managing the stack order of layers. When you add multiple layers in OpenLayers web application, all layers are stored as stack data structure. The layer which is added first, will be at the bottom of stack and layer which is added recently or last, will be on top of stack as shown
Layer’s ZIndex in OpenLayers Read More »
An event is some thing a browser does or a user does. An event can be a mouse click on button or a right click, double click etc. Map Events in OpenLayers are specific to map. These events can help the developers to achieve a particular task. For example, opening a feature information popup of
Map Events in OpenLayers Read More »
Hello Everyone, Welcome to next tutorial of open layers in which we will learn to create feature information tool on map click in OpenLayers. So what is Feature Information in GIS ? Feature information is Non-GIS information associated with GIS data. For complete source code of this tutorial, click here Check the Live Feature Information
Create Feature Information Popup tool in OpenLayers on map click Read More »
OpenLayers is an open source mapping JavaScript library which allows developers to develop highly interactive GIS web application. It can displays map tiles(or image) and vector data. In this post, we will create a simple GIS web app which will display OpenStreetMap on it. OpenStreet map is similar to Google Map. We will use a
Build your First GIS Web App using OpenLayers-Part 1 Read More »
