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1500 questions
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votes
1 answer

Representing overlapping lines in ArcGIS Desktop?

I have lots of lines (in one feature class) which share the same location but I want to represent them as lines that are next to each other because they have different properties (different OWNERS). So, my first try was transforming them in…
Ligia
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2 answers

Summing values in field using QGIS

Using QGIS 1.8, I've got a shapefile with an integer field called "AREA" and I'd like to sum the values which are in this shapefile. Does anybody know how to?
Robert 300
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17
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4 answers

Display photo stored as blob in GPKG

I maintain a layer in my project that indexes geotagged research photos. Right now, the layer (in a gpkg) has an attribute PhotoPath which points to the photos stored separately on disk. I then use a QML or HTML widget in the layer attribute form to…
Houska
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17
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3 answers

Expecting ArcPy to overwrite files in geodatabase file?

I'm writing a python script, I've got an mxd and its workspace is a geodatabase file with all the files I need into. The problem I'm encountering in testing and writing code is that, despite of the command: arcpy.env.overwriteOutput=True all the…
Annalisa Minelli
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17
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2 answers

What should QGIS course for advanced ArcGIS Desktop users cover?

I will build a 16 hour (2 day) course on QGIS for ArcGIS users. The target users that breathe and sleep ArcGIS. As we're trying to reduce our costs, we're thinking of switching some people to QGIS and having a floater ArcGIS license rather than have…
dassouki
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17
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6 answers

Python - Extract raster values at point locations

I'm a beginner with python. I would like to extract raster (.tif) values from a set of specific points that I have in a shapefile. I would like to have the same result as the QGIS Point Sampling Tool plugin. I can't install on Python libraries like…
kino
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17
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1 answer

Alternative indexing methods for point set operations

It is common to use a bounding box spatial index to improve performance when working with a large number of features. Where operations are performed against individual geometries with a large number of vertices do any similar optimization…
Matthew Snape
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17
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2 answers

Correcting gaps and overlapping polygon (parcels) geometry

I have come across a resource that we rely upon almost daily that is in terrible need of repair. It is not our own product and the supplier is generally not interested in fixing the problem. We are using a polygon shapefile which contains upwards of…
Michael Markieta
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17
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1 answer

Are there any Javascript map labeling engines available?

Does anyone know of a javascript library containing functions that would allow me to generate labels for points on the map so that the labels don't overlap one another, and have optional leader lines connecting the label to the point? I'm using…
Kirk Kuykendall
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17
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6 answers

Finding distance between two points with GeoSeries.distance

When I want the distance between two points [(117.454361,38.8459879),(117.459880 ,38.846255)] (longitude,latitude) on the earth, I take the GeoSeries.distance method, but the method does not give me the right answer. The real distance is about 479…
CJ Xu
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17
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3 answers

How to georeference a web mercator tile correctly using gdal?

As an example I will take the following tile http://a.tile.openstreetmap.org/3/4/2.png and save it as "4_2.png". The WGS84 coordinates of this tile can be calculated or read there by clicking the corresponding tile: 0 66.51326044311185 45…
Name
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17
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3 answers

Sorting attribute table by hidden column in QGIS Print Composer

In a QGIS 2.18.20 attribute table I have some values with random numbers, but at the print composer I want to show them with order (clockwise). So I made a new integer column, and added numbers with the way of sorting I want to appear at the print…
Pitheas
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17
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1 answer

Rasterio: Use case for src.meta vs. src.profile when reading and writing rasters?

When I read a raster in with rasterio (version 0.36.0) in Python, I can call up the metadata in two ways: src = rasterio.open(my_raster) src.profile {'affine': Affine(1.0, 0.0, 401900.0, 0.0, -1.0, 7620200.0), 'count': 1, 'crs': CRS({'init':…
Charlie Parr
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17
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4 answers

Seeking advice on generic open-source package roadmap?

I just wanted to ask for advice from the open source GIS gurus on a recommended stack to use for my envisioned project, as I do not fully understand the limits of the possible with most packages. I know I can do what I want using ESRI's various…
Jeremy
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17
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3 answers

Is there any way to include "universal" style/symbology in GeoPackage?

I am just playing with the GeoPackage format in QGIS. In QGIS it works nice with the style saved from QGIS but if I load it for example in SAGA the style is not applied. Is there any way to include at least some basic style (for example point colors…
Juhele
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