GIS

Visualize changes over time in GEE

Visualize changes over time in GEE

The area of interest, in this case, is Bungoma region of Kenya, and we would like to visualize changes over time. For this example, we shall focus over the years between 2013 and 2021 in the following steps. Search for the region of interest Add the data layer to the workspace and adjust the date…

Visualization Parameters in Google Earth Engine Explorer

Visualization Parameters in Google Earth Engine Explorer

Visualization parameters enable the user to have a better view of the dataset. On the layers panel of the Modis dataset, there is a visualization dropdown. Clicking on the dropdown results in the image below: In this platform, layers can be visualized in a single band or three-band display. A single-band display is used for viewing a…

Loading data in Jupyter notebooks

Loading data in Jupyter notebooks

A Jupyter notebook is a document that allows one to write code, notes and explanations as well as visualize the output of the code all in a single page. Its uses include data cleaning and transformations, data visualization, machine learning, simulations among others. Its numerous uses allow for working with multiple and varied data-sets from…

Display WMS Layer from GeoServer on Leaflet using Vue.js

Display WMS Layer from GeoServer on Leaflet using Vue.js

The Web Map Service (WMS) is an Open Geospatial Consortium (OGC) specification that defines an HTTP interface used to request a georeferenced map in an image format from a server. GeoServer supports WMS 1.1.1, the most widely used version of WMS, as well as WMS 1.3.0. WMS provides a standard interface for requesting a geospatial…

How to Apply Styled Layer Descriptor (SLD) in GeoServer

How to Apply Styled Layer Descriptor (SLD) in GeoServer

This tutorial will focus on outlining step by step process of applying a style on layer in GeoServer. A Style Layer Descriptor (SLD) file from QGIS will be used to style the layers. Launch QGIS and Export the Styled Layer Descriptor. Firstly, open QGIS and load the vector layer that you want to style. Apply…

How to Publish a Shapefile in GeoServer

How to Publish a Shapefile in GeoServer

This tutorial focuses on how to publish a shapefile in Geoserver assuming that GeoServer is already installed and running via the port assigned, for example, http://localhost:8080/geoserver. Data Preparation. Firstly, prepare the data that you wish to upload on GeoServer,  that is the shapefile. For example, if you want to upload a shapefile for national parks,…

Display GeoJSON Data on Leaflet Map Using Vue JS.

Display GeoJSON Data on Leaflet Map Using Vue JS.

This article will focus on integrating Vue JS with Leaflet and outlining step by step process of displaying geojson data on a leaflet map using Vue Js. Install NPM. Npm is the world’s largest registry used for management of development, sharing and borrowing of packages. Moreover, npm helps to download and use standalone tools. In…

Display Custom Icons using Leaflet and Vue Js.

Display Custom Icons using Leaflet and Vue Js.

Custom icons are a great way to display maps, especially while representing point features. This article focuses on outlining step by step process of displaying custom icons on a leaflet map using Vue Js. Install NPM. Npm is the world’s largest registry used for management of development, sharing and borrowing of packages. Also, npm helps…

Exporting vector data in GEE

Exporting vector data in GEE

This blog shows how to export images from the google earth engine. The blog on supervised classification is used, and we will be exporting the classified image to Google Drive as shown below. The code for exporting the image is as follows: Once the code is run, the exportation process is visible on the task…

How To Display a Leaflet Map Using Vue JS Framework.

How To Display a Leaflet Map Using Vue JS Framework.

The development of web applications is becoming more and more complex yet requirements for the user interface to be reactive is becoming the state of the art. To ease the complexity of building web GIS applications, it is necessary to find ways which will enhance code modularization, scalability and maintenance. One of the ways to…

Shapefile Conditional Columns in GeoPandas and Numpy

Shapefile Conditional Columns in GeoPandas and Numpy

While most shapefiles acquired from various sources are fairly ready to use with little or no edits, other uses may dictate that changes are made to a shapefile. One such instance is the need to add a column to a shapefile based on some condition. In most instances, the conditions may be too complicated such…

Importing vector and raster data in the Google Earth Engine.

Importing vector and raster data in the Google Earth Engine.

Vector and raster data formats are used in analysis in the Google Earth Engine. Vector data can be in formats such as shapefile, which is the most commonly used, Digital Line Graph (DLG), Keyhole Markup Language (KML), GeoJSON (Geographic JavaScript Object Notation), among others. Raster data formats on the other hand can be in GeoTIFF,…