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By Kacey Fitzpatrick This Wednesday marked the 45th anniversary of EPA’s establishment. A lot has been accomplished in those 45 years, largely thanks to EPA science! Read EPA Administrator Gina McCarthy’s message 45 Years of Fulfilling our Mission. “Science has been the backbone of the most...

In 2011, I wrote “How to Label Only Selected Features in QGIS”*which ends with the wish that Another “data defined setting” like “show this label (true/false)” would be more intuitive. … and now we have it! It’s called Show label and you can find it in the Rendering section of the labeling...

I would like to transform an irregular polyline into a straight one. Here are some details: I work with ArcGIS on a project in which I have an irregular polyline that is crossed by numerous streams. The idea is to show it as a straight line with the points where are the stream crossing in second...

محاور اليوم الدراسي التحسيسي الذي ستنظمه رئاسة شعبة الجغرافيا بمناسبة عقد الدورة الحادية و العشرون لمؤتمر أطراف اتفاقية إطار الأمم المتحدة حول التغيرات المناخية بباريس ( (COP 2 و.ذلك يوم الأربعاء 9 دجنبر 2015 بكلية الآداب و العلوم الإنسانية بالقنيطرة و بهذه المناسبة فإن جميع طلبة شعبة...

I was surfing posts on GIS stack exchange, as one does, when I came across this post featuring a French textbook figure on cartographic visual constraints. It’s a handy little reference piece on minimum point sizes, gap widths, line widths, area differentiation thresholds, and so on, so I...

Today we’re releasing version 2.3.0 of the Mapbox Android SDK with improvements across the board. Tilt Tilt is now fully supported by the SDK. You can set the angle programmatically via the setTilt() method, or using the standard two-finger shove: Multiple InfoWindows You can now...

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I have a feature class with fields: Latitude, Longitude, Type, Magnitude, City, State, Comment. If Latitude, Longitude , and Type are the same, I only want to keep the record with the highest Magnitude value (magnitude will vary usually). However, sometimes there are duplicates in the data...

Good afternoon, I have a bit of a complex task, and was wondering if anybody has knowledge that could assist me. Data: Water utility data that is not connected through a geometric network. Data includes Parcel (polygons), Water Service Meters (Points), Service Laterals(Lines), and Water Mains...

I'm having kind of a peculiar issue that I'm hoping someone can shed some light on. I'm actually creating my map in R, but I'm using QGIS as a tool to check my mapping process (R newb here). So let's dig into it. I'm trying to plot rivers in my area of interest (Tanzania), but the source...

I would like to base my query on the last row of a table? I know the basic syntax/functionality for my search cursor, how do I query only the last row; Below is an example of my search criteria, this data comes from a log of success/fail for a script that runs, I will base other decisions...

I have an Access Query where the Field names contain symbols like "-", ":" and spaces. When I was connecting my database to ArcCatalogue that specific Query-table was not visible. Then I used Replace function (in Access) to replace those symbols and spaces to "_". Then the table was visible in...

I am developing some code in Python, and I want to use the GDAL/OGR python bindings. What is the minimum I need to install in order to use the GDAL and OGR python bindings? What is the easiest way to install GDAL/OGR if I only want to use it from Python? I'm looking for an answer that applies...

This video demonstrates how to work with selection sets in QGIS. أكثر...

Re: Migrating from Sharpmap to Easy GIS .NET Hi, Easy GIS .NET does not support drawing your own layers, so if you do need this functionality you will need to do this using the paint event sorry. The library does include a ShapeFileWriter if you need to generate your own shapefile layers, but...

My python script in ArcMap has an initial dialog box with two inputs: REG_CODE (values are in a list and include 'AKR', 'IMR', 'NER', etc) and Selection_type which offers 'NEW_SELECTION', 'REMOVE_FROM_SELECTION', etc. My code runs just fine unless I pick the value 'NER'. Then I get this...

I'm trying to separate out records in a quasi-summarized table. Currently, my features are geocoded address points. Each address point has one record associated with it with a field showing how many trees were planted at the property. Most of the time there will only be one tree per property but...

I have two feature classes, one that contains all counties for 5 states and the other contains 90 polygons I need clipped only to their pertaining county boundary, but they overlap/ cross the county boundary (See image below). Both feature classes have a field with a unique 5 digit ID for each...

I am using a code to develop a map that would show geolocated tweets. The script is as follows: import tweepy from tweepy import OAuthHandler consumer_key='' consumer_secret='' access_token='' access_token_secret='' auth=tweepy.OAuthHandler(consumer_key, consumer_secret)...

How to extract a lineament from a DEM? Please keep the steps simple. أكثر...