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The best way to represent the Earth is with a globe. But map projections can be awfully useful too. Find out why cartographers use map projections in GIS. The post Map Projections: Flatten the Sphere appeared first on GIS Geography. أكثر...

I would like to dynamically classify a layer's symbology based on the current view extent. As in, quantities of a specified field will be classified into quantiles based on the range of values of the visible features. Since the symbology tab does not appear to support this out of the box, I need...

Would it be faster to work with a new band or a new raster column for a raster dataset in Postgres with new pixel values, assuming that the size, extent and everything else relevant remains constant? For example: If I've reclassified the raster column and want to retain the original values -...

I am working on a project about route chart and cross section generation for hiking with Hong Kong Lands Department's Digital Topographic Map B5000 (sample). Height information are required for this project but trails only contain X and Y coordinate. There're text with Z value near contour...

Geospatial technology plays a critical role in determining the right seed for the right location, and the right management practices to optimize production, while minimizing inputs. أكثر...

GIS is used to forecast the impact of imminent natural disasters and in prevention steps, thus mitigating vulnerabilities among populations. أكثر...

Built on the Esri platform, the app provides the framework through which collaborators explore and comment on productivity of rice, wheat, maize, and soy. أكثر...

LiDAR can be considered an acronym for Light Detection and Ranging. It is a remote sensing technology that’s used to measure distances, and it doesn’t act on its own. It actually — LIDAR typically includes three independently operating technologies. In this video Dewberry Director of Remote...

This question already has an answer here: After joining shapefile with CSV file graduated symbols option unavailable in QGIS? 2 answers This question has already been asked: Trouble with graduated...

I have successfully joined data from a csv file to a shapefile in QGIS but for some reason I am having trouble symbolizing my data. I want to use a graduated symbology however this option is not available for any of the columns for my joined table. I have tried saving as a new layer but this...

As more communities see the power that analyzing their data with location brings, GIS technology is being pushed to new levels. أكثر...

The strongest hurricane ever recorded around the Americas is set for landfall on the southwest coast of Mexico. أكثر...

I would like to load test the WMS capabilities for our GeoServer instance. How should I go about this? Server is running 64 bit ubuntu 14.04, Oracle Java 8, and geoserver 2.7.2 I know I could simply post the link to social media and have a bunch of people blast away at it but I don't know...

Can you please take a look at this code and let me know how I can add and remove some layers based on their index number in a Map Service? I tried this before but it is not working! Here is the HTML part: Layer 52 : Layer 53 : and the js is: var service...

Geo-location data from Tweets is used to identify early outbreaks of the flu. أكثر...

UK professor concocted Ashcloud Apocalypse to teach students how to use GIS to analyze disaster risks. أكثر...

I am attempting to add two rasters using the QGIS raster calculator and every output ends up as 'nan'. There were no problems with the raster calculator before trying to add these rasters, so I am stumped as to why it is not working with these rasters. The code is: "ForType@1" +...

I'd like to credit OpenStreetMaps with a small source attribution and a link at the bottom right of my application window, but I don't know how to do it. No amount of research I've done has provided any steps to do this programatically with an application built out of QGIS in Python. I'd just...

I am a developing a small plugin with python for QGis. I have a QLineEdit widget and I need to take the input from there. The input is a 8 character number string. However when I try to retrieve the text from the QLineEdit python returns a unicode object which does not seem to have any string...

This request is embarrassing simple yet I am having difficulty getting accomplished. I have internal client requiring an automated process, hence Model Builder, that creates a new feature class (user will need to name before run time) with attribute table based on a feature class used as a...