All Questions
163,894
questions
2
votes
0
answers
200
views
Simple user input in QGIS with pyqt plugin
SplitPolygon plugin allows the user to enter an angle by which the polygon(s) will be split. I would like to modify the plugin and take that value from graphical user input (say, parallel with one ...
- 131
2
votes
1
answer
3k
views
DEM reconditioning?
I'm using ArcGIS Desktop 10.5 Arc Hydro Toolbox & encountered a problem while trying to delineate watersheds respectively drainage lines.
The red lines indicate my obtained drainage lines, which ...
- 153
2
votes
1
answer
1k
views
Choropleth map from voronoi map from a set of coordinates (d3+leaflet)
I have a csv file with a set of coordinates with the following structure:
id,name,latitude,longitude
(24 values).
Those 24 points represent coordinates in a city. I would like to get a voronoi map ...
- 23
1
vote
1
answer
695
views
Expression to define label font in QGIS 3.2?
I am trying to define the font for features based on values in the attribute table. This is what I have tried in the Expression String Builder next to the Font dropdown in Layer Properties/Labels/Text:...
- 13
3
votes
0
answers
102
views
pyqgis: release all image locks
I have a QGIS 3.2 workflow that helps me to mass produce image classiication labels for some deep learning work. The workflow creates multiple files with various prefixes in tif format. At the end ...
1
vote
1
answer
3k
views
How can I set Style text from attribute in Openlayers
I have a feature layer in my application.
let layer = new OlLayerVector({
source: vectorSource
});
So I need to set a style for this layer. But style should write attribute value as ...
- 1,704
1
vote
1
answer
686
views
Filtering elements of layer with active element of QGIS atlas with geometry functions?
I'm working with QGIS 2.18
In a print composer I can filter the elements of a layer based on the attribute of the active element of an atlas. For example, show only the cities (points) of a state (...
- 175
5
votes
1
answer
169
views
Creating new Half-Inch Bartholomew-Style Maps in QGIS 2.18?
I have a full set of the old half-Inch Scale John Bartholomew maps produced up to the early 1970s (1972 - 1974) of Great Britain, and I'd like to produce new mapping in the same style, but with modern ...
2
votes
1
answer
128
views
Select by character limit
I'm using the select by attributes to find unique values that I am copy pasting from a spreedsheet.
EX "jobnumber" = 1111116 OR "jobnumber" = 2222245 OR "jobnumber" = 5555655 .. etc
The problem is ...
- 23
1
vote
1
answer
5k
views
How to extract values from .tiff file using R?
Maybe a rather simple question, but I could not find an answer. I am trying to extract long, lat, value from a .tiff file of a map of Africa with long/lat and soil acidity as the values.
Here is some ...
- 13
0
votes
2
answers
655
views
Shapefile from heading and distance directions for property boundary
I have a survey with heading and direction points describing the boundary for a rural property in Brazil. I am in correspondence with someone there who needs a shapefile (I believe he mentioned kml or ...
- 109
2
votes
0
answers
865
views
Publishing subtypes on ArcGIS Online for Collector?
I am kind of new to ArcGIS online and I just publishes a feature hosted map service after I have fixed my data with subtypes and subtypes-domains. After publishing to agol I discovered that all my ...
- 21
5
votes
1
answer
3k
views
Displaying overlapping polyline segments as multiple lines with offsets
Selecting which polyline is displayed on top in case of segment overlaps seems to be quite a FAQ, however, I would like to find a way to display overlapping polyline segments side-by-side, i.e. as ...
- 157
1
vote
2
answers
425
views
Extract by mask, default naming and arcpy
The extract by mask tool in ArcGIS has only two required arguments. The first is inRaster and the second is inMaskData. The filename and format of the output raster are determined automatically. The ...
- 3,524
1
vote
1
answer
74
views
Plotting monthly SO2 map [closed]
I need to plot a map to show monthly SO2 emission point over a specific area. To do so, I have an Excel monthly dataset (derived from satellite data) contains a column for latitude, a column for ...
- 9
3
votes
0
answers
280
views
Configuring wps service in the lizmap web client
I can run lizmap web client after configuring the lizmap web client according to Updated - Installing Apache, QGIS Server, And Lizmap Web Client On Windows OS. There is a way (Lizmap WPS Web Client) ...
- 31
3
votes
1
answer
2k
views
USA Albers Equal Area Conic USGS version (LANDFIRE) projection not read by R?
I am working with the North America Forest Dynamics dataset. As mentioned it uses the USA Albers Equal Area USGS version projection, which is primarily different from the USA Albers Equal Area ...
- 840
1
vote
1
answer
450
views
Dynamically rendering tiles in mapnik [closed]
I am working on a mapping project on an embedded system (~1 Ghz, 512MB RAM, 2GB flash storage). It is not feasible to pre-render all of the tiles and setup a tile server. Instead, I was planning to ...
- 137
2
votes
1
answer
2k
views
QGIS default style stored in PostGIS public.layer_styles table won't load with data from other schemas
In QGIS 2.18.15 (and 3.0), I cannot get default styles stored in 'public.layer_styles' in a PostGIS database to load automatically when adding a new layer to the map. I believe the problem is that ...
- 107
1
vote
1
answer
2k
views
ArcMap field calculator error 000989 indention error?
I'm trying to make a four character output based on concatenating a single character field (in1) with either 1 or 2 zeros, depending on the length of in2, and then concatenating that . I'm getting an ...
- 1,535
2
votes
0
answers
56
views
Merging bunch of tracks into fewer?
The following OverpassTurbo query for train routes in Sicily, Italy, returns ten's of tiny tracks:
[out:json][timeout:25];
//Sicily: 39152
rel(39152);map_to_area -> .searchArea;
(
node["...
- 1,433
0
votes
1
answer
324
views
Extracting raster values and creating new raster in QGIS is not working as intended
I am trying to extract certain values from a raster image in order to create a new raster which should then only contain the specified values. I have a single band raster showing forest loss from 2000 ...
- 23
8
votes
2
answers
6k
views
What is the new projection for Google Maps called?
Google released a new projection for the desktop version of Google Maps which appears to preserve the spherical nature of the Earth at all zoom levels. The old projection was called “Web Mercator”.
...
- 191
1
vote
1
answer
533
views
GeoTools: Encode into GML 3 not working
I want to use GeoTools to convert collection of SimpleFeature objects to GML 3.2.1 geometry.
However, I'm dealing with this:
Creation of XSD works with both GML 2 and 3.
Creation of GML works only ...
- 195
1
vote
2
answers
779
views
Import Cropland Data Layer
I am completely new to QGIS (and mapping in general), and I can't get my layers to line up.
QGIS Version: 3.2.1-Bonn Standalone-installer Windows 10 64-bit
All of my layers are in the USA ...
- 21
3
votes
4
answers
4k
views
Concatenating address fields with possible blank or null values in fields using Python parser?
The following Python code is what I have already tried in field calculator of ArcMap 10.5.1:
Pre-Logic Script Code:
def ConcatAddr(!JOIN_KEY!)
val = ""
if !Address! <> val
...
- 125
0
votes
1
answer
241
views
Carto Builder map not filtering dynamically
I have a Carto Builder map with several layers and widgets in it. I assumed that when filtering the widgets or the time series that the points on the map would also update to show only the filtered ...
0
votes
1
answer
229
views
Finding the percent of acres per landuse in ArcMap
I'm trying to add a field to my attribute table that shows the percent of acres per land use. I tried using this approach enter link description here
but I couldn't seen to get it to work for me. I ...
- 145
1
vote
1
answer
124
views
Editing the description in the dashboard view of a Carto map once the map has been published?
It appears that once you write a description in the dashboard view of a Carto map (where it says "Add description...") the text is un-editable. Is there a way to edit the text?
The map on the left ...
- 21
1
vote
0
answers
77
views
QGIS 3 map viewing area not filling up window area [duplicate]
I just installed QGIS 3.2.1 from QGIS 2.18 on MacOS 10.3.6. When I open the new install, the map does not fill up the area in the app window (below).
- 11
2
votes
1
answer
5k
views
Fill a comboBox with the result of a query to sqlServer
I need to fill a comboBox with the result of a query to sqlServer, this result is filtered according to the data that was entered in
the batch field
Try doing it with pyodbc, but when the form is ...
- 187
1
vote
1
answer
1k
views
Pulling Spatial Data in Geography Format From MS SQL Server 2008 Using ogr2ogr
Can the MSSQLSpatial driver support geography fields queried from MS SQL Server 2008 as spatial data?
Background
I have been using unixODBC on an Ubuntu 16.04 machine with ODBC Driver 17 for SQL ...
- 11
1
vote
0
answers
320
views
Opening National Land Cover data?
How do I open the National Land Cover data in QGIS 3.0? Attached is an image of the files. It looks like it's an .rrd file.
- 649
0
votes
1
answer
3k
views
EarthEngine - Layer error: Image.parseExpression: Expression parse error [closed]
I am trying to create a layer using conditional statement in Google Earth Engine. I have created a stack of two layers as follows:
var NDVI_2000_2001_2002 = NDVI_2001_2000.addBands(NDVI_2002_2000);
...
0
votes
1
answer
639
views
Pirmary key constraint on objectid field
I am trying to copy data from a PostgreSQL (9.4) DB table to an SDE table. Both have an objectid field. If I copy the data from the source table with the OID field, I get an error because the values ...
- 3
1
vote
1
answer
3k
views
AttributeError: DescribeData: Method fieldInfo does not exist
I have a script that looks at feature class inside a .gdb and prints some simple information about the attributes field. Note- these is actually only one feature class in the .gdb. I want use the ...
- 1,903
0
votes
2
answers
696
views
TypeError: 'int' object is not iterable in reclassifying raster using arcpy
I am trying to reclassify a raster, using arcpy in Python. My code is below
from osgeo import gdal
import arcpy
from arcpy import env
from arcpy.sa import *
raster_file = 'M:/tgopalakrishna\Data\...
- 840
2
votes
1
answer
179
views
Field Calculator incremental letters
Is there a way to calculate a field in ArcMap to be one letter up from another field? I'll never need to go beyond letter 'T', so no worries there.
Field Ltr| Field NLtr
a b
...
- 33
3
votes
2
answers
449
views
Geocoding sensitive addresses without API
I have a large set of sensitive addresses that I need to Geocode on a server. I cannot send them to an external API due to HIPAA restrictions. Ideally I'd love to use an open source solution, even ...
- 143
1
vote
1
answer
348
views
Lost pixels during a raster merge with gdalbuildvrt
I'm trying to merge some rasters with gdalbuildvrt in a python script:
rasters = glob.glob('/{0}/ndvi_masked/*.tif'.format(path))
gdal_cmd = 'gdalbuildvrt -q -vrtnodata "0" -overwrite {0}.vrt'....
- 1,516
1
vote
1
answer
582
views
Google Maps Android SDK - Get features based on user location
I am using Google Maps Android Utility SDK, using GeoJSON features.
I would like to, based on the user Location (which I already have) determine the features that contain this point.
Does Google ...
- 135
0
votes
2
answers
1k
views
Dissolve Shapefile and sum attribute in R
I have a shapefile with thousands of polygons and a separate csv of additional attribute data. I have joined these by
new_shp <- merge(old_shp, add_data, by.x="ID", by.y="ID")
However, now I ...
- 15
7
votes
2
answers
1k
views
How can I estimate a Least Cost Path in Google Earth Engine?
I'm using Google Earth Engine to estimate walking time based on slope, using the Google tutorial and this example based on a DEM. My code actually runs, but I don't know what units the output raster ...
- 503
0
votes
2
answers
299
views
Adjusting the extent of raster
I have a netcdf file which I converted using Make NetCDF Raster. Unfortunately, the x and y are not, I think, properly define. One way to solve this is by correcting the extent (I am not sure here) ...
- 1,188
0
votes
1
answer
243
views
Qgis Server Error while rendering postgis osm layer planet_osm_polygon
I have hosted QGIS server on a remote server. I want to publish OSM layer which is stored in PostgreSQL database. I have prepared one project file with .qgis extension and copied to the desired ...
- 313
2
votes
1
answer
352
views
Changing line type for boundary of two vectors?
I currently have two vector shapefiles containing polygons representing health geographies of England and Wales.
I would like to be able to change the line type for the boundary/lines between the ...
- 23
1
vote
1
answer
451
views
Using Geographic Transformation in Projection?
I copied my coordinate files into Coordinate folder inside Users\myuser\AppData\Roaming\Esri\Desktop 10.2\ArcMap\Coordinate Systems\....
The problem arises when I try to project using a custom made ...
2
votes
2
answers
816
views
ESRI fonts and QGIS
I should convert an ArcGIS cartography style (where the Esri fonts were used for the symbology) in QGIS. Is it possible to use the esri symbolic fonts and why some of them (eg ESRI Oil, Gas, & ...
- 643
0
votes
0
answers
171
views
QGIS/PostGIS Difference Geoprocessing with tolerance
This is probably an extended question from my another question (Increase spatial query performance (st_difference))
This is the background is this. I have a road link and a tunnel link.
From the road ...
- 1,040
0
votes
1
answer
2k
views
What is the Formula to get an Image's Bounding Box from it's GDAL GeoTransform Array?
I have a process which needs to read in an Image's GeoTransform Array, and convert it to the Bounding Box
i.e. If the Input is:
<GeoTransform>
7.8087700868360430e+05, 9.9974951285737870e+...
- 41.3k