Geographic Information Systems Weekly Newsletter
Geographic Information Systems Weekly Newsletter

Top new questions this week:

Automatically aggregate German ZIP codes by the first two digits in a shapefile

I have a shapefile which contains all German Zip-Codes in a a five-digit format (e.g. 80637). For what I intend to do, this is way to much detail. I would like to aggregate all Zip-Code areas by the …

qgis shapefile zipcodes  
asked by stekhn 6 votes
answered by radouxju 11 votes

Is it possible to interrupt Select Layer By Location when first feature selected?

I´ve got a point feature class with some 7.000.000 points and I´m trying to check if any of these points is simply intersected by several polygon feature classes using 'for' loop and …

arcgis-desktop arcgis-10.1 arcpy select-by-location  
asked by jonlew 6 votes
answered by Alex Tereshenkov 4 votes

Python resource for remote sensing?

I am looking for a good resource (MOOC, book, etc..) to teach Python for remote sensing applications. I am already familiar with - are there any other resource out there for …

python remote-sensing  
asked by Emily 5 votes
answered by G M 3 votes

What software do I need?

I run large site focused on history. Our current project expects the use of maps (for simplicity, we use current maps, not historical) with quite many points (custom SVG markers), lines, polygons on …

asked by Radek 4 votes
answered by Radek 1 vote

Bulk convert DBF to CSV in a folder ArcGIS 10.1 using Python

I would like to convert 1000 dbf files to CSV. All dbf files are in one folder and they have sequential names (S:\output_tables\tcb1.dbf, S:\output_tables\tcb2.dbf, S:\output_tables\tcb3.dbf, up to …

python arcgis-10.1 arcpy csv dbf  
asked by user27239 4 votes
answered by blah238 3 votes

How to make Map Book with facing pages numbered near outside edge?

I am creating a map book but do not want the page numbers for each map page to be on the same side (since its printed double sided), I need the page numbers to be placed on opposite sides? I am using …

arcgis-desktop data-driven-pages  
asked by user42720 3 votes
answered by MAJ742 4 votes

Account for bridge overpasses in a ground DEM to allow for water flow under the under the overpass

I have a bare earth DEM made from lidar data (A). It works well and has passed all accuracy tests. It is used in storm surge models. The problem we are having is on underpasses. I need to allow water …

dem lidar hydrology streets  
asked by user27239 3 votes
answered by Martin 2 votes

Greatest hits from previous weeks:

Why do you use ArcGIS for Desktop?

I'm new to GIS, having only dabbled with ArcGIS for Desktop for about 4 weeks in 2007. The business I am at wants to target writing complete solutions that involve GIS as it would benefit their …

asked by JonWillis 37 votes
answered by George 23 votes

What are Definition, Algorithms and Practical Solutions for Concave Hull?

Convex Hull A convex hull of a shape is defined as: In mathematics, the convex hull or convex envelope for a set of points X in a real vector space V is the minimal convex set containing X …

geometry convex-hull algorithm concave-hull theory  
asked by Adam Matan 57 votes
answered by fmark 30 votes

Can you answer these?

Slow ArcMap Start up

My ArcMap take about 3-4 minutes to start. It was good before with less than 10-20 sec start time. I have Dell Precision 6500 Laptop with 16 GB Ram with i7 processor. I could not figure out what is …

arcgis-desktop arcgis-10.1 arcmap  
asked by Bimal 2 votes

How to get Drainage Divide and Streams from DTM

Does anyone know how you can get a map like this attached, having the digital terrain model? I'm sorry, but I do not know what is the exact technical term in English for them. I hope you understand …

qgis arcgis-desktop dem  
asked by user37547 1 vote

Postal codes in shapefile overlapping

I downloaded some shapefiles from the Australian Bureau of Statistics (ABS). Its basically showing a bunch of suburbs when I view the shapefile through a GIS tool. The GIS tool that I am using at …

shapefile overlapping-features australia postal-code  
asked by Allen Ho 2 votes
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