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I have a series of point data from a .csv file that I would like to display as a heatmap raster, the .csv data have various attributes with them and I would like to adjust the color ramp based on which of those attributes I select. My first thought was to apply a color ramp to a vector grid...

The App Challenge Esri recently wrapped up the The Esri Human Health and Climate Change App Challenge. This was an awesome opportunity for geo developers everywhere to come up with solutions that utilize Esri technology to help health and human services professionals understand the impacts of...

I'm trying to add a temporary field to one of the input feature classes in my Python toolbox. arcpy.AddWarning("Adding field of type " + fieldType.upper() + " to FC " + varFC + " called " + tempField) arcpy.AddField(varFC, tempField, fieldType.upper()) The first line outputs as I'd expect...

I need to color each polygon based on its area and length. I can loop through all polygons, find out their area .geometry().area() and if it is larger than 100 meters squared, than I want it to be green, otherwise red. Is it possible? I found solution for one attribute. (How to set the color of...

I have created my web application with the Web AppBuilder Developer edition, downloaded the zip file and customized the index.html file in my localhost environment. Everything works fine until I change the name to index.php. I am doing this because I have some custom php code that I want to...

I use point geometries (table 'label_point') to place multiple labels on polygon geometries (table 'soil'). After doing layer edits I've to update the affected label_point features. Therefore I've created a trigger function. CREATE TABLE label_point ( gid serial NOT NULL, geom geometry(point...

http://catalinagis.org/ownership You can see that some of the parcels don't follow the fill style rules (opacity: 0.5) even though the same style rule applies to all polygons in the data. This happens when the data is loaded into http://geojson.io and...

The Problem: I'm pretty new to leaflet and I'm trying to add a outline of the states over my OSM layer via WMS. I've found several tutorials online, some directly from the leaflet website but haven't had any success. My code: var map; var feature; function load_map() { map = new...

We are transitioning from Google Maps to Mapbox. Mapbox is a proponent of geoJSON and uses it extensively, so we are considering adopting it for all of our maps. An issue is the creation of the geoJSON from Postgres v9.3.6 with PostGIS v2.1.5, and within PHP This is my current SQL query...

Mount McKinley, as of today, is now Mount Denali. It's an important change, one that honors local indigenous names and draws attention to the very real threat of climate change impacting that part of the world, so we're glad to see President Obama stepping up to the challenge and calling...

The pace of technology and change in the modern world can be dizzying. As new medicines and treatments are developed, new types of waste emerge. However, our hazardous waste generator regulations were written in the 1980s and haven’t changed much over the years. Well, today we’re taking steps...

By Annette Poliwka Ocean samples collected on board the Mystic found plastic throughout the 3,000 mile journey. My love of recycling, or better said, my hatred of trash led me to a research expedition through the North Atlantic Subtropical Gyre, a portion of the Atlantic Ocean that traps...

After tweeting today about the Unmitigated Amzingness that is a QGIS + Git workflow, someone suggested that I write a blog about my experiences in this regard. Unfortunately today is a deadline day for a portion of what will become my next book* so I can’t put a lot of time into a full-blown...

I am trying to make use of a codeblock found in this thread: How to remove numeric characters from alphanumeric value in field calculation? I put this code into the pre-logic script field of the field calculator: import re def strip_digits(s): return re.sub("\d+", "", s)And call it in the...

I am running a script that pulls certain .mxd files out of a folder and prints them for me. For some reason, when I use the script, part of the layout is cutoff; on the other hand, when I open each .mxd individually and print, everything comes out fine. Is there a way to control the print...

I'm looking for a way to suppress a map click event if some other event has already happened. The application I have created has two primary functions: Click on marker (park points) --> Brings up information about the park you clicked onOR Click on the map (outside of a marker) --> Clears the...

I followed the answer given in this topic for searching the distance to the nearest coastline given a lat/lon coordinate. The distance output obtained is in degree (I think) but I need the distance expressed in meters. By citing the answer given: There will be a units problem if you create...

I am using OpenLayers 3. Here i found how to create and read drawn features. Now i am trying to delete a feature after i draw it on the map. I have tried several methods , but it doesn't want to delete the selected feature. Draw features example...

One of things I’ve seen people struggle with when using the ArcGIS API for JavaScript 4.0beta1https://developers.arcgis.com/javascript/beta/) is still the concept of the map and the views. I covered the general concepts in an earlier blog post, but I wanted to address a specific issues I see...

Despite the amazing advancements of computing technologies in recent years,processing and displaying large amounts of data dynamically is still a daunting, complex task.However, a smart approach with a good algorithmic foundationcan enable things that were considered impossible before. Let’s...