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1500 questions
26
votes
3 answers
Publishing PostGIS Rasters in GeoServer?
How do I publish PostGIS rasters using GeoServer?
I have spent a lot of time trying to create a Raster datasource using Image Mosaic JDBC but with no luck.
Steps performed:
1. Downloaded and Installed the JDBC Image Mosaic extension (worked ok)
2.…
asp
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26
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6 answers
What is Change Detection and performing such analysis with open source tools?
From wikipedia page:
Change detection for GIS (geographical information systems) is a process that measures how the attributes of a particular area have changed between two or more time periods. Change detection often involves comparing aerial…
nickves
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26
votes
9 answers
How can I convert an excel file with x, y columns to a shapefile?
How can I convert an excel file with x, y columns to a point shapefile?
There are some somewhat optional requirements in addition to the correct creation of a shapefile:
Column types (as per Excel's format specifiers) should be retained (especially…
fmark
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26
votes
4 answers
Rasterfile clipping error: Cannot compute bounding box of cutline
I have a raster file and want to clip it, a vector file is supposed to be the mask layer. I use the most obvious method (Raster->Extraction->Clipper).
No matter what I do, I get this error (see picture below):
Cannot compute bounding box of…
Shepherdjo
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26
votes
9 answers
Any low-cost Virtual Private Servers able to run GeoServer?
I'm looking at virtual private server hosting options for GeoServer. At a recent conference, the most often cited cost of such servers was around $50/month. I've found a few places that advertize VPSs for much less, some as low as $17/month. The…
Don Meltz
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26
votes
2 answers
How do I write a GeoPandas dataframe into a single file (preferably JSON or GeoPackage)?
I'm new to GIS and having a basic beginner problem. I've got data in the form of a geopackage .gpkg from GADM.org. I can read in and use the data without problem using Geopandas (via built-in Fiona).
I've added and deleted some columns to the…
Aaron Bramson
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26
votes
2 answers
Setting layer transparency in QGIS 3
I just switched from QGIS 2.18 to version 3.0.3. In the earlier version, setting layer transparency was easily done with the "transparency" slider from the Layer properties->style tab. See image below:
The newer QGIS version, however, does not…
LandryF
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26
votes
4 answers
Is it possible to reproject spatial data using SQL Server?
SQL Server takes an SRID when creating spatial data, but is it possible to retrieve with a different SRID translating the coordinates?
For example, let's say I have a bunch of spatial polygons using SRID 4258, but I'd like to use alongside some…
Rowland Shaw
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26
votes
2 answers
How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?
Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order to compute a "more precise" 2D location.
(We do…
John Doisneau
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26
votes
3 answers
Hand drawn sketchy symbology styles for GIS software
Often times in planning projects, a hand drawn, sketchy look is desirable in order to convey the preliminary nature of a project.
Is anyone aware of any utilities/plugins for desktop GIS software (ArcGIS, QGIS etc.) that enable the user to apply a…
Brent Edwards
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26
votes
1 answer
Setting up indexes for PostGIS distance queries
I'm building an application that is supposed to query and return every Record in a table that is X kilometers away from PointX. Records and PointX's positions are determined from (long/lat) information provided by Google Geocode API.
I'm new to…
andrerpena
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26
votes
9 answers
Looking for system specifications for a modern GIS workstation
My current employer has given me the opportunity to design my own GIS workstation. The problem is I have no idea what is important when it comes to hardware! I have been given a datasheet from Fujitsu which includes the latest CELSIUS M720 series…
Robert Buckley
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26
votes
4 answers
Welding individual line segments into one LineString using Shapely
I'm using Shapely in python and I'm given a MultiLineString with a bunch of Linestring objects. I can guarantee that all the LineString objects are simple lines with only 2 vertices and that they are all part of one single line (no branches).
I want…
Raychaser
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26
votes
5 answers
Is there a professional certification available for QGIS users?
I have heard some rumors about a QGIS professional certification program.
I have found some documentation on it at https://hub.qgis.org/wiki/17/Certification but have been unable to find any other articles or web links.
Does anyone know if there…
Kingfisher
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26
votes
6 answers
Shapefile loader in pgAdmin 4
Recently I have updated my postgresql version. I have also upgraded pgAdmin from 3 to 4. But I was unable to load shapefile. I didn't find any plugin called shapefile loader. How can I get the shapefile loader plugin in pgAdmin 4?
Devils Dream
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