Wanjohi Kibui

Generating Contours from  DEM in QGIS

Generating Contours from DEM in QGIS

      A few weeks ago I wrote a post on “Generating DEMs from Contours” which was quite a straight forward process as explained.In this post , I will show how to “reverse engineer” the process and generate contours from DEMs. This time round am also going to demonstrate how to clip our dataset to work…

Using Free GPS Tools for Mapping
GIS

Using Free GPS Tools for Mapping

Sometimes we find ourselves lost while travelling. Right? But have you really tried to leverage some of the modern technology on your mobile phones to avoid trouble while navigating? Thanks to technology as of now, some of the things we wished for before are a reality. We can utilize powerful mapping apps effectively and for…

Maps for the Color blind

Maps for the Color blind

We are living in an era of digital maps.We’ve evolved from static maps to dynamic maps where different formats(icons,pictures) of information are being developed and shared by a large group of people globally.When mapping,less often do we consider the color blind.How do you paint a picture or develop a map when the color blind is…

Generating DEMS from Contours in QGIS

Generating DEMS from Contours in QGIS

Well, Today was a great day in my GIS works. A colleague asked “Can I generate a DEM of my region using QGIS?” This was my answer to them “YES”. Then they asked me “How?” I ended up spending the next one hour doing the demo on my laptop for them to grasp the rough…

Adding layers from GeoServer in QGIS

Adding layers from GeoServer in QGIS

In a GIS, the ability to handle more data formats is of key priority while developing the system. This gives the GIS users a wider variety of formats to choose from during their analysis. QGIS has implemented this by allowing users to add data from many sources and in many formats. Loading a WMS, WFS…

Publishing maps using QGIS Cloud

Publishing maps using QGIS Cloud

Sharing the outputs of your GIS work with other people on the globe has become a common practice nowadays. The methods used in sharing this information matters and depends on a number of things;the availability of storage space to store your datasets, the cost of operating a web map,user interactivity of your web maps,the kind…

GIS

Adding data into ExtJS grid from PostgreSQL with PHP-The JSON format

Data loading from a database into an application is useful more so if there will be frequent changes on the data stored in the databases. The data is loaded from the database when the application is loading. Any changes on the data are reflected into the grid carrying our data in the application. I will…

Open-Source Web Maps

Open-Source Web Maps

During my second year of college, I came across this technology where maps could be rendered online (web mapping) and users could interact with the maps for visualization and analysis. I found this technology interesting and decided to give it a shot. I encountered the “usual” barriers experienced by any beginner in coding. Then, I…

Tourist attractions in the USA

        USA is prominent worldwide for its ample and startling tourist attractions. It has interesting and fascinating sites in the world and thus receives millions of tourists annually.       Tourists flood this country every year to see for themselves remarkable, outstanding  and most attractive spots like the Niagara falls, uncountable parks and grand canyon only…

RICE GROWING IN MWEA, KENYA

This is an explanation of the activities involved in growing rice in Mwea irrigation scheme. INTRODUCTION Mwea irrigation scheme is in Kirinyaga county, Central province and is the biggest rice producing scheme in Kenya. Rice is a highly-valued staple food in Kenya. Rice yields well in black-cotton soil and needs ample supply of water for…