All Questions
163,951
questions
0
votes
2
answers
96
views
Shapely Not Determining Point in State
I am pulling State geometry data from a database (populated from Shapefiles) to find what state a coordinate pair is in. I was originally using GeoAlchemy, but tens of thousands of queries to ...
- 165
2
votes
1
answer
4k
views
Map with ggplot2 and bubbles
I've tried to plot a map of magnitude earthquakes in Colombia with ggplot. After many efforts, I got it. But, I need to focus in specially area where the data of magnitudes is (4, 4.1, 4.2, 4.3, 4.4, ...
- 115
3
votes
1
answer
491
views
Performing raster calculations with more than two bands in PostGIS?
We need to perform raster calculations using more than two bands in PostGIS. At the moment, ST_MapAlgebra has a two-band form but doesn't support more than that.
I'm open to any solution others ...
- 81
2
votes
0
answers
204
views
Why does QGIS Browser 2.12.1 keep freezing/crashing when I try to view a csv data table?
I've just downloaded QGIS Lyon 2.12.1. The desktop application works great but the browser crashes whenever I try to view a csv data table. I've gotten it to work once out of ten tries. I click on ...
- 73
2
votes
2
answers
458
views
Creating Multiple Webmap Applications linked to the same data
I am creating a webgis system for a smaller municipality. They need 3 different webmap applications, all of them referencing the same data. 2 of the apps are for public view and only contain certain ...
- 51
3
votes
1
answer
321
views
Cannot pass python string outputs as inline variables in modelbuilder
I'm trying to pass a couple of strings from python as parameters in the extract by mask tool in modelbuilder. Unfortunately it doesn't recognize them. When I type them in the parameters it thinks I'm ...
- 63
1
vote
0
answers
26
views
How to send multiple features in the SOE response for the multi point input locations?
For multi point input locations, I need to send multiple features in the SOE response. How do we combine the multiple byte[]
result = FindNearFeatures(layerID, location, distance.Value);
- 19
0
votes
1
answer
1k
views
compare three rasters and three conditions with overlay in r
I'm trying to run an overlay function with rasters where I want to meet all of 3 different conditions at each cell and produce a single raster as output.
Running ifelse with the & operator ...
- 3
3
votes
1
answer
656
views
Remove holes from polygons using geometry objects
I've written a script that should remove holes from polygons with use of cursors and geometry objects. However, holes remain even though I'm constructing new polygons from the vertices from the first ...
- 13.9k
2
votes
0
answers
232
views
Benchmarking ArcPy / ArcMap Performance on different computers? [closed]
This project came out of my need to build a justification for a faster work computer. Before asking for new equipment I want to be prepared to show the increase in performance by adding RAM or more ...
- 273
1
vote
0
answers
225
views
Loading existing datasets into empty geodatabase (with schema) in ModelBuilder with iterator and append?
I'd like to load existing feature classes within a dataset in one geodatabase into a new, empty geodatabase with schema already set up. Both geodatabases, the one containing the data and the one ...
- 11
1
vote
2
answers
2k
views
Embed a (saved) Leaflet map in an Ioslides presentation
I'm building some fairly complex maps with the leaflet package and I'd like to embed them in an rmarkdown document (specifically an ioslides_presentation .Rmd file).
Right now the code for the maps ...
- 396
1
vote
1
answer
1k
views
Extracting channel banks from DEM and channel network
Currently I am working in project that require from me extracting channel banks. I have been thinking about the best method that I can use to come up with good function that extract the location of ...
- 13
1
vote
1
answer
2k
views
Script Error 'Invalid Pointer' in Spatial Analyst Tool [duplicate]
I have ArcGis 10.3 (previously 10.2 version) running on Windows 10 (previously Windows 8). My GIS licence is provide by my company where I have an intership, so I can't just uninstall/install back the ...
- 11
2
votes
3
answers
3k
views
View image file from hyperlink in Arcmap identify tool result
I have a file path to an image file in an attribute table, eg;
C:\GIS\ScannedMaps\Map1.png
When I use the identify tool on the feature I can see the file path with the hyperlink lightening symbol ...
- 469
0
votes
1
answer
913
views
Using Web Mercator with OpenLayers
I am using OSM basemap in my openlayers application.
var OSMlayer = new OpenLayers.Layer.OSM( "Simple OSM Map");
//Creating a Map
map = new OpenLayers.Map('map', {
maxExtent : ...
- 1,704
1
vote
0
answers
624
views
gdal2tile problem geneting tiles
Our problem is that we need to convert a shapefile to raster. Then, we need to generate tiles from zoom 15 to zoom 17 (2millions tiles to 16millions tiles).
Before we were using this methodology:
...
- 123
1
vote
1
answer
3k
views
Google Maps Distance Matrix API - Queries per second?
I'm pretty familiar with Google's Distance Matrix API, but I'm unsure about one aspect of the Usage Limitations. The documentation states that you have access to 100 elements per query (element = ...
- 41
2
votes
3
answers
81
views
Ratio of area between park and residential parcels
I have three shapefiles: park, residential parcel, and participants of a survey (single Point shapefile with 100 dots).
I want to find a ratio of area (park/residential parcel) within 1 and 0.5 mile ...
- 45
6
votes
1
answer
614
views
Establishing Default Query layer for Google Earth in "Map to KML" export from ArcMap?
I export a lot of maps for customers who request them from our office. Recently I have seen more and more requests for us to export our GIS into the .KML or .KMZ file type so they can be viewed on ...
- 557
0
votes
1
answer
114
views
Feature service is not added to map using ArcGIS API for JS?
I'm trying to search features using the "esri/search" module. I'm passing the parameters to callback function (Search) to add a feature layer and search features, but i don't see any features added on ...
- 33
9
votes
1
answer
2k
views
How to edit virtual field definitions in QGIS?
I have a virtual field in QGIS. The values are updates depending another column with a concatenate CASE statements.
I would like to edit this statement but I cannot see it.
I have attempted to use ...
- 929
0
votes
1
answer
473
views
Tilemill/openstreetmap-carto, how to remove unwanted road lines
I am using Tilemill and the openstreetmap-carto style.
The latest versions of each.
I was curious to why these Center-lines are showing up in my highways and roads, and I am unable to get rid of them. ...
- 535
5
votes
2
answers
3k
views
Intersect, Spatial Join?: One Line crossing Multiple Polygons, assigned wrong attribute
I am looking for any possible solutions to a problem I am encountering with ArcGIS.
I am using census block groups (CBG) to assign streets an income level value based on their location within the ...
- 51
0
votes
1
answer
189
views
transformation, CRTM05 Projection
I'm using ArcGIS 10.3
I have a network dataset with GCS_WGS_1984 coordinate system
and a layer of districts of Costa Rica country with Unkonown Spatial Reference
TOOLS ta use "defined Projection" ...
3
votes
2
answers
485
views
How can I extract flat surfaces from a DEM with GRASS GIS?
How can I use GRASS GIS to get the flat surfaces in this DEM into polygons? The picture is used to show the clearly defined flat surfaces.
- 487
2
votes
1
answer
3k
views
GeoDjango, distance filter based on database column
I have a geodjango model with fields
coverage = 10 * 1609.344
reference_point = Point(-72,45) #or some other lat lng
class ServiceArea (geo_models.Model):
center = geo_models.PointField(default=...
- 31
2
votes
1
answer
819
views
Link Excel Table to Access/Arcmap Personal Geodatabase Table
My overall goal:
My coworkers have an excel table which they update/use frequently. The table is not in a format that arcmap can decipher. Therefore, I've created a locked sheet (in the format I ...
- 807
0
votes
1
answer
478
views
Can updates be made to "ogr_fdw" foreign tables in PostgreSQL?
I am accessing a Microsoft SQL Server table (w/ SQL Server a geometry column) via an ogr_fdw foreign table. SELECT statements work great, including the PostGIS functions that I've tried.
Are UPDATES (...
- 14.6k
1
vote
0
answers
164
views
Arrows with direction and proportional to attribute
my data looks like this:
> main
end.station start.staion Freq end.latitude end.longitude end.station
1 359 519 929 40.75510 -73.97499 E 47 St &\nPark Av
2 ...
- 2,092
8
votes
2
answers
6k
views
How to join a table to a shapefile with non-matching IDs and names (similar strings)?
I'm having an annoying problem that I'm trying to find an automated solution for. The shorthand version is that I have a shapefile and a table of created data for regions within countries. The created ...
- 1,902
0
votes
1
answer
141
views
output raster size in zonal statistics [closed]
Using zonal statistics, my input raster is 1*1 and input value raster is 10*10. I was hoping the output raster will be 1*1 but it is 10*10. What is the error here ?
- 351
2
votes
1
answer
290
views
Select a subset of a PostGis table
I'm using a big table imported by a *.shp file of the city of San Diego. When I run pgr_dijkstra it takes more or less 5000ms, even for small distances. I was thinking, in order to improve performance,...
- 331
6
votes
1
answer
2k
views
GDAL Sentinel-2 driver
Sentinel-2 images are usually provided in JPEG2000 format inside a zip-file with accompanying metadata.
A driver has already been coded and will be shipped with GDAL 2.1: GDAL Sentinel-2 driver
As ...
- 9,909
2
votes
0
answers
148
views
Predicting map using maxent software [closed]
I am in the process of developing predicting map in MAXENT. I have current data of distribution of my trees species in tropical forest. I need to use Maxent software and Arcgis 10.3 to find the ...
- 21
1
vote
0
answers
1k
views
Using GDAL in C++. Create multiple GDALDatasets using a GDALDriver produces error 4 not recognised as a supported file format [closed]
I am trying to create multiple GDALDataset objects. All of them are supposed to be in the .tif format, so for all of them I use the same GDALDriver.
I am working in C++ (Visual Studio) and when I ...
- 21
1
vote
0
answers
143
views
Use QgsRasterCalculator inside function
I'm relatively new to PyQGIS and I'm building a plugin to perform some calculations between raster layers. I was seeking to use the QgsRasterCalculator for some operations, however, the function that ...
- 465
1
vote
1
answer
61
views
Is it possible to use ArcGIS to define a boundary around a self-constructed 3D feature?
I am creating a 3D rendering of a future building and would like to know the distance from which this building would be visible from. Is it possible to use ArcGIS to define a boundary that delineates ...
- 49
2
votes
3
answers
2k
views
How to remove 'no data' values in sentinel 1 data? - Sentinel Toolbox
I hope anyone can help with this issue:
I am using the Sentinel Toolbox to preprocess Sentinel 1 GRDH scenes. Managed to radiometric calibrate, conduct radiometric terrain flattening and geometric ...
- 141
2
votes
1
answer
871
views
How can I add r.local.relief to the QGIS Processing Toolbox?
I'm working with QGIS 2.12 and GRASS 7.0.3RC1. I'm making a model using the model builder and trying to add the GRASS addon "r.local.relief" in my QGIS model, but the addon does not show up in the ...
- 349
4
votes
1
answer
337
views
'Fix' offset and undersized data in QGIS
I'm currently working on a project to visualize some climate data, among the datasets I'm using is the data from the NCEP/NCAR Reanalysis Project.
Now, this data comes in a regular (non-gaussian) ...
2
votes
1
answer
589
views
Find nearest point given coordinates from another table [duplicate]
So I have two tables, one table is called stores which has the name of the store as well as the geom column that contains the coordinates for the stores. The other table is customers which has the ...
- 611
2
votes
1
answer
1k
views
Changing raster value based on point feature
I am working on some landslide modeling.
Within ArcMap I have a raster layer, representing the area of the county I am working in, and a point layer that shows landslide locations. I reclassified ...
- 75
1
vote
1
answer
477
views
Create GRASS Mapset in QGIS 2.12
How do you create a new GRASS mapset in QGIS 2.12? The GRASS panel has only the Open GRASS Tools button.I don't see any way to actually create a GRASS mapset in QGIS.
- 259
4
votes
1
answer
4k
views
PyQGIS: Change attribute value doesn't work, results in NULL
I am writing a QGIS plugin, which at one point attempts to change several attribute values on a layer. However, in the end no changes are made. If I punch similar code into the built-in Python Console,...
- 313
1
vote
1
answer
2k
views
Mapbox GL JS Geocoder marker
I'm still a js noob.
I am currently developing a map using the Mapbox GL JS API with their geocoding plugin, however, I'm am not seeing any examples of adding a marker after the return.
I did find ...
- 307
6
votes
3
answers
538
views
Vertical datum query for coastal modeling
I have a USGS derived DEM with a vertical datum of EGM96 from NASA satellite data. My Bathymetry uses a lowest astronomical tide datum.
Has anybody come across this or similar issue before?
I need ...
- 191
4
votes
2
answers
161
views
ogr2ogr of NTF_Lambert_II_etendu is off by about 30 meters
I am converting RPG files in NTF_Lambert_II_etendu to wgs_84 using:
ogr2ogr -t_srs EPSG:4326 ilot_2008_027_wgs84_2.shp ilot_2008_027.shp
but the result is off by about 30 meters. Surprisingly, the ...
- 165
1
vote
4
answers
4k
views
Using Raster calculator in Modelbuilder ArcGis 10
I am using Modelbuilder to calculate several rasters with different parameters for each grid cell. One of the final steps is to calculate the log of one of the rasters using Raster calculator. ...
- 129
6
votes
1
answer
4k
views
Automatically updating user-edited features in QGIS plugin
I am working on a plugin for QGIS (2.12). It uses data stored in an Spatialite database. When the user creates a new feature, the plugin should:
update the feature attribute table (the popup form ...
