Converting between different coordinate reference systems or projection is a fairly standard feature in a GIS. There are a number of command line tools also available for performing bulk-conversions. cs2cs program, part of the PROJ.4 library is my favorite. Recently, someone presented me with an interesting challenge. They were collecting field data in UTM coordinates and needed … Continue reading Convert between UTM and Degree coordinates using Google Spreadsheets
I recently attended the OpenAQ workshop in Delhi . The workshop’s goal was to bring tech, science and media folks working on air quality together and brainstorm how to use open data to tackle air pollution challenges. Below are my notes and links to materials presented during the workshop. Below are my notes and links to materials … Continue reading OpenAQ Workshop Notes
This weekend, I got an opportunity to volunteer with a non-profit called Junglescapes. We took a day trip to the Bandipur forest in Karnataka where they have done extensive work in forest restoration. One of their success stories is working with the locals to remove invasive species such as Lantana from the forest. Junglescapes volunteers and … Continue reading Line Transact Surveys using OpenDataKit(ODK)
GeoPDF is a unique data format that brings the portability of PDF to geospatial data. A GeoPDF document can present raster and vector data and preserve the georeference information. This can be a useful format for non-GIS folks to consume GIS data without needing GIS-software. While GeoPDF is a proprietary format, we have a close alternative … Continue reading Creating Geospatial PDFs with GDAL Tools
Mapshaper is a free and open-source tool that is best known for fast and easy simplification. Other tools for simplification - like QGIS or ogr2ogr - do not preserve topology while simplifying. This means you may get sliver polygons or missing intersections. Mapshaper performs topologically-aware simplification and gives you much more control on the process. Other … Continue reading Geo Data Processing with Mapshaper
The Association for People with Disability (APD) is a non-profit organization based out of Bangalore, India. Their mission is to reach out and rehabilitate people with disability from the under privileged segment. Over the past year, I along with my colleagues have been volunteering with them to develop a system that can help improve their field data … Continue reading Implementing a Field Data collection app for APD
A long pending weekend project is done. Printed, cut and folded a sturdy globe using the template from Le Paper Globe. This is not only fun, but a good prop to learn more about Geography. I envision it would make a fun do-it-yourself project with kids of all ages.