livingatlas.arcgis.com
Redirect
#gischat is an active hashtag on Bluesky. In the last 30 days, 40 people shared 153 posts with it — around 5 a day. Activity is down 29% versus the previous week, peaking on Jul 21 with 10 posts.
Tags most often used together with #gischat.
livingatlas.arcgis.com
Redirect
geohub-natureserve.opendata.arcgis.com
International Vegetation Classification Groups v1.0
This layer presents information on the distribution of International Vegetation Classification (IVC) Groups for North America.
news.nationalgeographic.org
Advancing empathy and equity through maps
Featured photograph by Kris GravesWhen National Geographic Explorer Clinton Johnson views a map, he sees a story. A self-described antiracist geospatial archite...
www.maps.com
The Underwater Cables That Connect the World
Explore the fragile and mostly unseen infrastructure that carries 99% of international data traffic and provides internet access around the world.
Geo Women+
Starter pack by Kiri Carini
Awesome women+ in the geospatial and earth observation field. Let me know if you want to be added!
www.esri.com
Esri's approach to responsible AI
Speed and efficiency alone don’t guarantee better decisions. Here’s how Esri is building AI that’s grounded, transparent, and built for the decisions that matter.
tinyurl.com
Build Your Own Solution with the ArcGIS Solutions Assistant
Welcome to the world of vibe solutioning – a new way to build solutions in ArcGIS!
An EFF investigation has found that some advertising SDKs enable location data collection by default. The findings aim to warn app developers that some of the third-party code they place in their apps may also collect their users’ location data when they grant permission to the app.
www.eff.org
modtools.wordpress.com
Centering a map projection on the mapped region
The PROJ format for defining Coordinate Reference Systems (CRS) is becoming deprecated, as PROJ strings cannot accurately store modern datum transformations, coordinate epoch information, or complex axis order rules. However, that format is much easier and more practical for humans to type and read, and it is still often used as a legacy convenience. I, for one, use it often for centering a map projection on the mapped region, thus avoiding the distortion that occurs away from the projection center. For example, imagine I want to map New Zealand in a Lambert Azimuthal Equal-Area projection: library(terra) library(geodata) nz <- gadm(country = "New Zealand", level = 0, path = tempdir()) nz_prj <- project(nz, "+proj=laea") plot(nz_prj) The map is heavily distorted, because it is far away from the center of the projection, which is 0,0 by default. With the PROJ format, we can easily set the center wherever we want, e.g.: nz_centr <- crds(centroids(aggregate(nz))) nz_centr # 172.6104 -41.82592 nz_prj <- project(nz, "+proj=laea +lat_0=-41.8 +lon_0=172.6") # (this can be further automated to avoid the hard-coding, # but I keep it like this here for simplicity) plot(nz_prj) Much better! We now have an equal-area map of New Zealand without visibly distorting the shape, and without having to look for specific equal-area CRSs normally used over there (and again every time we need to map another region of the world). This works as long as we use the WGS84 ellipsoid rather than a local datum, as those are currently not supported when using PROJ. So, I’m still using this regularly, and apprehensive about PROJ being deprecated… If anyone knows of a non-PROJ way of easily defining user-centered projections like this, please let me know! ### Share this: * Share on X (Opens in new window) X * Share on Facebook (Opens in new window) Facebook * Like Loading... ### _Related_
Posts are pulled live from Bluesky and cached briefly. Posts with content labels are hidden.