4
votes
0answers
21 views

Why is Shapely's snapping (GEO snaps) not working as expected?

I'm trying to snap two lines to each other using Shapely/Geopandas but the result of the snapping is very odd. I tried : import geopandas as gpd from shapely.geometry import * from shapely.ops ...
4
votes
0answers
37 views

Customizing ISO 19139 metadata profile in ArcCatalog?

I'm using the ISO 19115/19139 metadata standard, and I need to convert some optional elements into mandatory elements. Is it possible to achieve this using ArcCatalog as the metadata editor? About ...
4
votes
0answers
94 views

Raster calculator creates strange output

I am trying to combine two raster layers (one is nighttime satellite data, the other is the GPW population density data). I am using raster calculator to combine the two (the following is for a ...
4
votes
0answers
53 views

Cannot Open VRT of Sentinel2 image created by AutoCreateWarpedVRT

I am trying to create a warped VirtualRaster of a Sentinel2 image. Here the Python code I tried: from osgeo import gdal, osr srs = osr.SpatialReference() srs.SetFromUserInput('EPSG:32632') gdal....
4
votes
0answers
52 views

Using QGIS for current SAR (Search And Rescue) operation?

A friend of mine, Christiaan Wilson is missing since 15 may during descending the Dhaulagiri mountain in the Himalayas. One searching team has already finished one operation. A second is on the way. ...
4
votes
0answers
55 views

How do I load 1 billion points into PostGIS?

I have a file geodatabase containing research data that I need to load into PostGIS. The GDB contains one feature class with one billion records with three columns (the FID, a FK, and the geometry (...
4
votes
0answers
30 views

Using QgsNewVectorLayerDialog

I am using QgsNewVectorLayerDialog for taking user input for creating a new shape file. When the user clicks OK i am reading the inputs selected by the user using the following code. dlg = ...
4
votes
0answers
48 views

How to prevent automatically redraw the graphic layers on ArcObjects?

After a Shape File that was read to IFeatureLayer converted to IGraphicElements, I'm trying to draw that on map (using Sublayer of ICompositeGraphicsLayer). Of course, I succeed to display it on map, ...
4
votes
0answers
65 views

Connect data from two different layers

I'm trying to connect data from two different layers to combine them in one new layer and continue working with them. Let me explain that a bit more detailed: The first layer contains data (and ...
4
votes
0answers
150 views

I can't create/save changes in shape files on QGIS

I can't create or edit shapes in QGIS, the files are created on my system but cannot "fill" it with the features. I'm using QGIS 2.14.2 64bit Windows 7 This is the error i get when trying to save a ...
4
votes
0answers
115 views

Error after successful ArcGIS PrintTask

Using ArcGIS Javsacript API on one server to grab a PDF from a custom print service published on a different server. We have used the exact same script successfully on other apps/servers before with ...
4
votes
0answers
50 views

GRASS7 r.water.outlet doesn't run correctly in QGIS 2.14.2

I am a new user of GIS software and I am currently facing an issue with the GRASS7 tool `r.water.outlet. I am a beginner with both Linux and GIS. I am using Ubuntu 14.04 with QGIS 2.14.2 and GRASS 7.0....
4
votes
0answers
38 views

Animate panning map in QGIS?

I want to create a short video illustrating the route of a proposed road by starting the map in one position, then panning to a number of other points. Is this possible in QGIS using the time manager ...
4
votes
0answers
39 views

Calculating distances (differences?) between two regions?

I am building a machine learning system which predicts the location of tweets as a bounding box (using the google maps API among other things). Since the twitter API also supplies a bounding box, I am ...
4
votes
0answers
27 views

How can I get a numerical (or value) display for equal intervals in a layer?

I'm looking to classify regions on a map by the amount of light pollution in the area. I have the varied intensities (0 through 60) plotted using a color map, but is there anyway that instead of a ...
4
votes
0answers
58 views

Some characters in OpenStreetMap display as rectangles

I installed tileserver based on the instructions provided here for Ubuntu 14.04 using this approach . All fonts and Shapefiles were downloaded and installed from INSTALL.md. The tileserver works ...
4
votes
0answers
54 views

Issues updating field values programmatically for particular field data type on 64bit Windows computer using QGIS 2.8.7

I have an issue with a plugin for QGIS 2.8 I'm developing when using it on a Windows 64bit machine (as opposed to 32bit). I am trying to update values in a particular field in my plugin, and the ...
4
votes
0answers
49 views

How to get NIR values into a LAS file then a CSV?

We are trying to deliver a LAS file with NIR values added for each point. The NIR comes from a raster captured at the same moment as the LiDAR, and is stored as an 8bit number along with RGB in 8bit. ...
4
votes
0answers
26 views

Is there a way to use the GDAL C++ API to find areas of overlap between two SAR images?

I have a bunch of SAR images (about 1 GB each) on which i need to do some image processing. Each image is georeferenced and there is significant overlap between each pair of images in the set ie. one ...
4
votes
0answers
39 views

Are there any MSSQL Licencing restrictions regarding ArcGIS Server Services

I use ArcGIS Server in conjuction with MSSQL Server 2012. According to my Database Administrator there could be licencing restrictions on the side of MSSQL when publishing Data over the web with ...
4
votes
0answers
104 views

Import Vector data to QGIS from pdf and apply georeference

I am Using QGIS 2.14. I have a pdf created by Mapinfo, it contains multiple layers of vector data that I can open as separate vector layers in qgis. However no map projection data was saved to the pdf....
4
votes
0answers
41 views

Ice type differentiation using satellite data

I would like to classify glacial area by categories of snow (if there is) and ice, but what's most important: between old ice and fresh ice. They have different properties that are possible to ...
4
votes
0answers
72 views

Cell Statistics standard deviation values incorrect

I'm having some issues with the Cell Statistics tool in a python script I am writing. I am using 30 years worth of global cumulative annual rainfall data as input and am getting strange values in some ...
4
votes
0answers
110 views

Which statistical methods to compare the spatial distribution of two different variables in two raster maps?

I am working with two global raster maps using the R Software (original file: netCDF for map 1 and GeoTIFF for map 2), with a resolution of 5 min of arc. Map 1 contains data on the share of the land ...
4
votes
0answers
42 views

QGIS canvas: I cannot remove blue “nested” grid/rectangles in canvas (BTW what is it?)

A blue "nested" grid suddenly appeared in the canvas (see image below). I don't know what I did to make this happen and how to get rid of it. Can anyone please advise me on how to remove this?
4
votes
0answers
31 views

Qgis Python - Legends in Horizontal

I have successfully added legends in Map using Qgis QgsComposerLegend () python programming .(using Qgis python console) but legends are added vertically.I wanted to place legend horizontally. If you ...
4
votes
0answers
58 views

How to reproject MODIS L2 data with lat/lon

I downloaded the MODIS level 2 data for precipitable water vapor (MOD05_L2.A2015193.1535.006.2015194020321.hdf) and the corresponding geolocation file (MOD03.A2015193.1535.006.2015193213734.hdf). When ...
4
votes
0answers
29 views

Parallel feature request connection limit

I have a large pool of feature requests that need to be performed on a PostgreSQL layer. Please assume that these requests cannot be joined into larger requests. If I spawn several threads to perform ...
4
votes
0answers
51 views

TypeError: QgsEncodingFileDialog

I am using the latest version of QGIS (Lyon) on MAC and have set the default Python version 2.7. Moreover, I have installed all the required python modules and GDAL. It was working before, but now, ...
4
votes
0answers
43 views

Is it possible to have a locked TOC in QGIS

I would like to customize QGIS for a custom use case where the user will work with a very simple customized UI and will just digitize features in existing layers. Therefore the TOC should be locked, ...
4
votes
0answers
60 views

How do I implement PyQGIS multithreading to update a progress bar

I am developing a PyQGIS plugin using python. I facing a problem during the implementation of threading in my plugin. I have written a python script which contains a class wrapping all geo-processing ...
4
votes
0answers
76 views

How to choose the EPSG projection?

Up until now for reprojection of my WGS84 vector (.shp) and raster files (.tif), I have been using EPSG projections based on vector/raster central point's UTM zone. But what happens if the envelope-...
4
votes
0answers
78 views

Crop raster based on another raster R

library(raster) How can one clip one raster based on another raster? RasA: class : RasterLayer dimensions : 459, 533, 244647 (nrow, ncol, ncell) resolution : 10000, 10000 (x, y) extent ...
4
votes
0answers
62 views

Insert sequential row and column values automatically into a fishnet dataset

I have a grid that has about 30 rows with approx 15 columns each. I want to label them as A1,A2,B1,B2 etc (Alphabet row, integer is column). Is there any way to do this programatically? There is no ...
4
votes
0answers
98 views

QGIS/OGR shp to tab export - crashing Mapinfo due to number format issues

I created a vector grid in QGIS and it exports as SHP -no issues. When I save as tab and try to open the file in MapInfo it crashes. According to https://groups.google.com/forum/#!topic/mapinfo-l/sO-...
4
votes
0answers
93 views

Thematic map exported using QGIS2Web is extremely laggy

I have made a world thematic map and added layers of data for creating graduated color scheme on the country level. I need a interactive map as an output which shows values when user hover over any ...
4
votes
0answers
33 views

Changes to Clip and Intersect between 2.8 ltr and 2.12 for lines

Clip and Intersect in 2.8 yield the result as expected. When using 2.12 the shape file is empty. To test this I have run both versions on Linux (Opensuse Leap) and OSX. The results are consistent. ...
4
votes
0answers
85 views

Postgis sequence in QGIS not working

I have a Multipolygon-Layer stored in a Postgis-database. The primary key field 'gid' is SERIAL. When trying to add a new polygon in QGis (LYON 2.12.1 on OSX El Capitan), the attributes form shows me: ...
4
votes
0answers
64 views

Calculating angle using three WGS 84 points

I am looking for a way to calculate an angle between two points at a specific third point. My coordinate system is WGS 84. I can measure the angle with QGIS clicken on those three points, but I want ...
4
votes
0answers
60 views

QGIS Atlas: Filter maps based on attributes (more than one)?

I have a series of maps with the same geographic boundaries but with different set of points (from the same layer). I would like to create an Atlas where the change is based on the attributes. A ...
4
votes
0answers
72 views

Can I clip a geodatabase vector layer in QGIS?

I have a Vector layer loaded from a .gdb (geodatabase directory). I'm seeing my contour lines fine. I've drawn a polygon on top of the area I want to crop on a new layer. I select Geoprocessing ...
4
votes
0answers
127 views

Different styles in same label

I have a multiline label made of 3 attributes made through an expression like: "Length" || '/' || "Level" || '/' || '→ ' || "Bearing" || ' ←' I'd like to make the Length and Level lines in ...
4
votes
0answers
77 views

Geocoding API: house number precision for Europe (Germany/Austria), other than google?

I am looking for an affordable geocoding option with the following criteria: commercial use <500$/month allows to store LatLng results in my DB house Number precision for Austria and Germany ...
4
votes
0answers
78 views

The drawing of Thiessen/Voronoi polygon boundaries - are the bisecting lines truly perpendicular?

I am concerned with how QGIS (version 2.8.1) and ArcGIS (version 10.0) draw "perpendicular bisecting lines" when Thiessen/Voronoi polygons are created. When using either program to create these ...
4
votes
0answers
61 views

How to unproject a UTM ESRI Shapefile over WGS84 extent boundaries

Background: I am working on a collaborative project in Python that uses GDAL/OGR to work with rasters and vectors. There is one function that attempts to project one ESRI Shapefile's coordinate ...
4
votes
0answers
72 views

QGIS Profile Tool shows no profile

I have installed and followed the process to produce an elevation profile from the Route Profile plug-in in QGIS, but for some reason I am getting no profile to appear. The grids are from OS ...
4
votes
0answers
79 views

Custom forms feature in QGIS: QMessageBox.warning closes QDialog as well

I am attempting to work with custom forms in QGIS. I have included a validate function in my code that will pop a QMessageBox() if the validation fails. My problem is that when I close the QMessageBox ...
4
votes
0answers
155 views

Creating a Vector Tile base map

I want to create a vector tile base map using my own shapefiles/postgis tables for use on a mobile primarily. By my understanding the process is divided into 3 main steps: Creating/slicing the data ...
4
votes
0answers
45 views

Combine multiple adjoining parts of a single feature

In QGIS, one polygon feature resulted from merger of several adjacent polygons. This one new polygon feature has a single line through it that I would like to eliminate. When hovering over individual ...
4
votes
0answers
77 views

OS terrain 50: .vrt from zip files

I tried to follow what was suggested in How to use OS Terrain 50 in QGIS, but I got the following problem: in spite of being generally able to generate .vrt files using gdalbuildvrt from unzipped ....

15 30 50 per page