Often one has points in QGIS in a given coordinate system and wants them in latitude and longitude for various reasons. Solutions I have used in the past included converting to WGS84 EPSG:4326 and then using the field calculator in QGIS to calculate X and Y values for Longitude and Latitude respective, exporting to CSV while projecting to 4326, or pulling into PostGIS and writing … Continue reading Latitude and Longitude of projected points in QGIS
I’ve been working on base cartography for the research area in Rwanda. Unlike here in Cleveland, we have some great topography to work with, so we can leverage that for basemaps. But, it’s such a beautiful landscape, I didn’t want to sell these hillshades short by doing a halfway job, so I’ve been diving deep. Background First, some legacy. I read three great blog posts … Continue reading Gorilla research in Musanze, Rwanda: Hillshades continued
In previous posts here1, here2, and here3 discussed a then and future trip to Rwanda to help with GIS and gorilla research. No more in depth write up yet, but I’ve been working on some of the cartographic products to show in the background of maps. Since Rwanda is so beautifully hilly (read: mountainous) and the research is focused on the Virunga Mountains (volcanoes) themselves, … Continue reading Gorilla research in Musanze, Rwanda: Hillshades!
In previous posts here1 and here2, I discussed a (then future) trip to Rwanda to help with GIS and gorilla research. I cannot say enough good about the experience. The people of Rwanda are warm and welcoming, the research team at Karisoke (Dian Fossey Gorilla Fund International) hard working, brilliant, and fun. For now we’ll do some pictures to give flavor. Then I’ll build out … Continue reading Gorilla research in Musanze, Rwanda
Want to load your favorite tiles into QGIS? How about a plugin-free QGIS TMS tiles via GDAL: http://www.3liz.com/blog/rldhont/index.php?post/2012/07/17/OpenStreetMap-Tiles-in-QGIS Really awesome… . Needs but one change: epsg:900913 should be epsg:3857 or QGIS (GDAL?) throws an error. Presumably you could also define epsg:900913 in some config file, but barring that create an XML file as follows, and load as a raster in QGIS: Now I can use … Continue reading Plugin-free QGIS TMS tiles via GDAL
Just an image today. Continue reading Drone Pointilism
In my earlier post, I made a claim that SFCGAL was used in this figure: It dawned on my afterwards, while I was using 3D, I hadn’t actually employed any of the analysis goodies that come with SFCGAL. Well, here it is– a footprint as calculated using the view angles and a real terrain model: Here it is compared with the initial calculation: Continue reading UAS (drone) Footprint Geometries Calculated in PostGIS with SFCGAL — for real this time
UAS (drone) Footprint Geometries Calculated in PostGIS (viewed in QGIS nightly), taking into account relative elevation, bearing, pitch, and roll, this time just one: Continue reading UAS (drone) Footprint Geometries Calculated in PostGIS — Individual Footprint
Search the Google for geocoding in QGIS and you find a few nice articles, mostly pointing to third party web sites that will geocode for you, e.g. this post from 2009. It’s a good post, but there’s an easier way now. Well, let’s see if a little SEO will help solve this for people– a great tool for geocoding in QGIS is MMQGIS. Add it … Continue reading Geocoding in QGIS, the easy way.
Credit where credit’s due on the great QGIS Compositing (as well as some stellar forthcoming raster tools): http://nyalldawson.net/2013/03/coming-soon-in-qgis-2-0-blend-modes-for-layers/ I thought I had seen an unusually large spike in my Aussie traffic… . Continue reading QGIS Compositing, credits where due