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1500 questions
31
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4 answers

Donating and volunteering geographical knowledge?

I know a lot about the places I visit, and I want to share it with everyone. I have been donating and volunteering at OpenStreetMap, and I am also aware of Google Maps. Where else can I help with collaborative mapping?
Lucas
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4 answers

Drawing wavy/wiggly lines in QGIS

Is there a QGIS function or plugin to draw wiggly line? I have used "Spline Tool" to manually draw some waves, but it is time consuming. If possible, I would like to draw something like: Inkscape Function Plotter (sin(x) curve).
Kazuhito
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31
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10 answers

Seeking Python tools/modules/add-ins for GIS?

With ArcGIS 10, Python has become the de-facto scripting language for ESRI. While leading Open source software like QGIS, GeoServer, PostGIS all supports Python. Thus it became important to know/learn Python for GIS developers a well as users. Can…
thelastray
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31
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2 answers

Creating sector lights in QGIS?

I'm using QGIS 2.18. I need to create sector lights for navigational purposes on a map. I have the light sector data as fields giving becon_id, start degree, end degree and color in a shapefile with over 500 buoys, beacons and lighthouses that need…
Benjamin Donner
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31
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2 answers

How to access file geodatabase in Qgis?

How does one access data from an Esri file geodatabase in Quantum GIS? I've seen snippets of conversation that indicate it's possible with qgis 1.7+ and gdal 1.9+ but no clear recipe. I recognize that in a few months or a year this will likely be a…
matt wilkie
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31
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5 answers

Changing feature draw order in QGIS

Probably a very basic question here, I want to change the draw order of a shapefile in QGIS, how can this be done? As you can see in the picture below, only the "10" layer is shown, the others are below it... However, since this is a depth map of…
Nils Jonsson Forsblad
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31
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3 answers

Is there a "Select by Attributes" plugin/widget for ArcGIS Server JS API?

I'm hoping to find some existing code which emulates the "Select by Attributes" dialog in ArcMap, within the ArcGIS Server JavaScript API. Writing a hard-coded QueryTask is easy - I'm looking for some code which will automatically handle any layer…
Stephen Lead
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31
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4 answers

How to define layer order in Openlayers?

I have a marker layer, two vector layers and two raster layers. The marker layer gets covered by the two raster layers. Is there a way to move the marker layer always on top? Edited: The order of Z-indexes works well in the vector layer, but when I…
Seen
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31
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6 answers

Finding GIS consultancy/project work (rather than jobs)?

The post What are useful websites for scouting GIS related jobs? listed resources for finding a GIS job (as in a full-time or contract position). What resources are available for finding GIS projects or consultancy work? eg: a small project to…
Stephen Lead
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31
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6 answers

Getting ArcPy to work with Anaconda?

I am trying to follow the step-by-step directions in the answer to "how to separate Python installation with ArcGIS" but cannot find the path file, DTBGGP64.pth, in C:\Python27\ArcGIS10.2\Lib\site-packages. Has someone has faced a similar issue? I…
user26750
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31
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2 answers

What is the precision of Geohash?

I would like to know the precision of a Geohash with a given length. If there is a 'simple' formula you can use to calculate it, that would be extra-cool. Wikipedia lists the precision up to 8 characters: # km 1 ±2500 2 ±630 3 ±78 4 ±20 5 …
Gundon
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31
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9 answers

ArcCatalog says spatial references don't match between feature dataset and feature class with same coordinate system?

I have a feature dataset that is using the GCS_WGS_1984 as the geographic coordinate system. It includes a few feature classes. This feature dataset is itself in a file geodatabase that contains a few more feature classes in the root of the gdb. One…
mindless.panda
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30
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3 answers

Postgis TopologyException: side location conflict at 226.001 39.5158, what's the problem?

after st_union() PgSQL returns a note: NOTE: TopologyException: side location conflict at 226.001 39.5158 And in the results there are two rows with empty geometry and other rows are ok. What causes that problem? How to solve it?
Pablo
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30
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5 answers

Grouping and counting attribute data in QGIS

I want to group and count features with the same code attribute value. I can classify the data and enable feature count in the layer list but I cannot get counts in the attribute table.
Seren
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30
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4 answers

How to find the maximum-area-rectangle inside a convex polygon?

In this post we are looking for algorithms / ideas on how to find the maximum-area-rectangle inside a convex polygon. In the following figure, numbers are the areas of the fitted rectangles. As shown a desired rectangle can vary in each dimension…
Developer
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