0
votes
0answers
27 views

QGIS vector data, graduated symbology (choropleth), discrete class bound values [duplicate]

This doesn't seem to bother anyone else, so maybe it's just me. I'm using QGIS to create a choropleth map of historic property boundaries. Since settlement occurred in pulses, I'd like to use Jenks' ...
1
vote
1answer
32 views

How do I generate a distance table using 2 different point files and a line file?

I have two point datasets, one containing multiple transit stops and the other containing multiple schools. I also have a street line dataset. I need to generate a table that gives me the shortest ...
0
votes
0answers
8 views

QGIS Import Interlis Points problem

When i'm importing a Interlis 1 file (*.itf and *.ili) to QGIS 2.8.1 (or 2.6.1) the polygones are visualized correctly but all the tables containing POINTS (LFP1, Grenzpunkt,...) couldn't be ...
2
votes
2answers
147 views

Performing math in Python parser of ArcGIS field calculator?

I never used python but now I need a code to do this calculation: I'm doing this: math.atan(math.fabs( !Y2! - !Y1!)/math.fabs( !X2! - !X1!) )*(180/math.pi)
30
votes
5answers
1k views

Is there GIS Video “that Mom can understand”?

Working as a professional within the GIS discipline, I often find it challenging to describe to people what GIS is (in a face to face conversation). Telling them that GIS stands for Geographic ...
2
votes
0answers
18 views

Making Python Add-In using tools built in ModelBuilder?

I have made a set of tools in a toolbox using ArcGIS 10.2 using the model builder. I would like to distribute them as a tool bar, and so created a ArcGIS Python Add-In I was hoping that I could ...
0
votes
0answers
15 views

UniqueValueRenderer on GUID fields doesn't work

Have anyone been using ArcGIS UniqueValueRenderer on attribute fields of type GUID? I've created a UniqueValueRenderer that has a default symbol. If I do: renderer.Fields.Add("OBJECTID"); or ...
1
vote
1answer
33 views

ArcGIS Field Calculator nested elif is None not working

I am calculating a field based on two other fields in ArcMap 10.2 using python. My Pre-Logic Script Code is def myfunc(legend,Btype): if(legend == 'Apple'): return 'Banana' elif(legend == ...
1
vote
1answer
22 views

Georeferencing/Spatial Adjusting of vector river dataset to DEM in ArcGIS

I have a huge dataset of vector river data (over 10'000 rivers) which are saved in a shapefile and were initially derived from a topographic map. However when comparing this vector to DEM data (SRTM ...
0
votes
1answer
155 views

how to apply same color ramp to two line symbols?

Working in 10.2. I want to show two different line feature classes, one with just plain lines and the other with arrow-headed lines. The feature classes have the same categorical field I use to ...
5
votes
1answer
139 views

Automatically build branches of a river network?

A small non-profit specializing in fish habitat restoration, has asked me to link a spreadsheet of field notes to their GIS. What we have is: A spreadsheet of field notes for small fish streams. A ...
0
votes
0answers
10 views

Limiting returned records for an interaction in OpenLayers 3

I have the following script that returns a list of all the customer names at that point when it is clicked on. I am looking to limit this to only show the first (or just one) record.Could this be ...
1
vote
1answer
40 views

Postgis ST_Distance query returning inaccurate results

I am using the following query to retrieve records from a postgresql DB @services = Service.select("*, ST_Distance(services.lon_lat, ST_GeomFromText('POINT (lat lon)', 4326)) as ...
0
votes
1answer
10 views

Geojson mapevent second mouse click

I am trying to add a geojson layer with interactive functionality to my leaflet map. I am mostly using this (dated)blog: ...
2
votes
1answer
140 views

Most efficient way to use UTM in leaflet

Our server is using UTM internally. We then send a large number of UTM Coordinates to display them in a custom made leaflet layer. First we transform (unproject) them into "normal" geographical ...
1
vote
0answers
47 views

How can I speed up a slow ArcGIS Server 10.2 - PostgreSQL (9.2) ST_Intersects query?

I am troubleshooting a slow st_geometry query in Postgres 9.2 that uses ST_Intersects--a basic Select from table where ST_Intersects type query. table_extent ...
-2
votes
1answer
28 views

Merging bulk data in 10.2 ArcGIS

I have to merge 50 datasets. All datasets have same feature classes. please suggest me fastest way. append, merge, load, all methods will take time. please suggest me fastest way.
3
votes
1answer
29 views

How to remove a feature from a layer created with “Make Layer From Selected Features”?

In ArcGIS desktop, I select some features from a feature class (say with the "Select By Location" function), and then right-click and choose "Selection--> Make Layer From Selected Features"(online ...
1
vote
2answers
52 views

How to make a routable network topology?

We are trying to make a network topology for pgRouting from our own data. But there is a problem we could not resolve; our road data look like this; The red edge is a single geometry, so we can not ...
0
votes
0answers
14 views

ArcMap 10.3 compatibility with HEC-geoRas

Does anyone know if I can use HEC-geoRAS software with ArcMap 10.3 version?
0
votes
0answers
43 views
+50

Publishing Tools does not start in arcgis server 10.1

I'm trying to publish a service in arcgis server 10.1. In the last phase I encountered with this error: I tried to start the server as described in the error message. I encountered with this error: ...
1
vote
1answer
14 views

How to remove band from stack in ERDAS 2013?

I have a Landsat 8 scene where I have stacked 11 bands. I need to remove one band from the stacked layer. Is there a toolbox in ERDAS 2013 that allows me to take out a band? I am aware that ENVI ...
5
votes
3answers
3k views

How to find the nearest point from POI in PostGIS?

I have Point of Interest data in MySQL. This are the fields latitude,longitude,address,types in which I have stored the data. Now i want to import it into PostGIS Database. But does it required ...
0
votes
1answer
47 views

Geocode several addresses in QGIS

I am using QGIS and I have an Excel file that has fields with direction and it fails to geocode these addresses. Examples: address apartment township 1 calle 2 avenida ...
6
votes
2answers
2k views

Is it possible to show Pie charts in QGIS Legends?

I would like to display some pie charts on my map. They show in the map frame perfectly but in legend on the print composer I am unable to show the legend for the pie charts. QGIS just shows the style ...
2
votes
1answer
123 views

QGIS 2.8.1 ogr OpenFileGDB zip format

I am experimenting with the OGR OpenFileGDB zip file format in QGIS 2.8.1 on Windows 8.1 x64 and although OGR says it can happily read the format (with a couple of Code Page warnings) I am unable to ...
-1
votes
1answer
14 views

Latitudes and Longitudes in Atlas

I have seen some Atlases and Maps where North or South or plus(+) for North or minus(-) for south is not mentioned/suffixed with the degrees of Latitudes in the graticules. Is it correct? How will a ...
0
votes
1answer
16 views

How to disable layer(not hide) in OpenLayers 3

In my map, I have multiple layers. For certain operations I want to only work on one layer. The other layers should be visible, but disabled, so that they can not be selected or interacted with in ...
0
votes
0answers
19 views

Drawing fastest route between two points

In reference at this example https://gist.github.com/miccferr/f0716649c82e5cefc5eb i'm trying to visualize the fastest route between two points. After i drag the position marker I would like to click ...
0
votes
1answer
31 views

How to convert latitude, longitude to EPSG 3857?

I'm looking to study the math involved to see how a given latitude and longitude in decimal degrees can be converted to epsg 3857. Can anybody point to a good reference or a possible python/c/c++/java ...
1
vote
0answers
16 views

In QGIS what data file formats (etc) can be directly edited and which only viewed?

QGIS allows for opening very many different file formats (SHP,TAB,CSV,Spatialite,...) Some of these are directly editable (SHP, Spatialite, ??) Some of these are only viewable (TAB, CSV, ??) I'd ...
0
votes
1answer
653 views

How to narrow the result from Nominatim with only cities and countries, no additional areas with the same name?

I'm trying to get WKT or GeoJson polygons of cities and countries from Nominatim (for example, Paris and France). I send a GET request but it returns me several results named "Paris" or "France". How ...
4
votes
1answer
48 views

Buffering Points Directionally

I have about 10,000 points that I want to apply a partial circular buffer to based on an angle, from -30 to 135°. A similar question for polygons seems to have been answered here, but I cannot make ...
0
votes
0answers
23 views

R: how to get time-zones from latitude and longitude in raster?

I have a raster with longitudes and latitudes for the US with meteorological data (for about 100k grid points). I would like to get the time zone for each point in order to transform the time to local ...
0
votes
2answers
17 views

Importing and exporting KML into and from DashDB for Geospatial Analysis

I am a recent convert to IBM's DashDB, and I considering proposing to use it at my work. My case would greatly be bolstered if I could show good, easy integration for geospatial analytics data, namely ...
0
votes
1answer
10 views

How to add hyperlink in geojson popup in Leaflet?

I am trying to add a geojson layer with interactive functionality to my leaflet map. I am mostly using this (dated)blog: ...
1
vote
1answer
17 views

Set up GDAL for C++ in RHEL

I've got GDAL installed from the latest 1.11.2 source, but when I try to make by C++ executable I get undefined references to "GDALAllRegister" and basically all the GDAL functions I call. The same ...
2
votes
1answer
62 views

ArcGIS Server - Secured Services

Is there any way to tell, via the SOAP or REST APIs, if an ArcGIS Server map service requires an authenticated user? I have set an application to use a token service for accessing secured map ...
1
vote
0answers
9 views

How to get Set-Cookie header from ArcGIS REST services?

When I call an ArcGIS REST service, I get Cache-Control, Etag, Content-Encoding, Content-Type, Transfer-Encoding and Date headers. But I don't get Set-Cookies header. Is there a way to get this ...
2
votes
1answer
130 views

Standalone script looping incorrectly?

Following on from my previous question, I would like the script to do the following (includes illustration): Search for the first shapefile (Paris (O).shp) in Country_France > Original files and ...
0
votes
0answers
10 views

How to make the value showing on a leaflet heatmap like this one?

I'm attempting to use leaftlet.js, and heatmap.js (github.com/pa7/heatmap.js/) following this example: www.patrick-wied.at/static/heatmapjs/example-heatmap-leaflet.html But I want to show the value ...
1
vote
1answer
144 views

Connecting to PostGIS (LATIN1) from Microsoft Access 2010 - Encoding problem?

I want to connect to a PostGIS table Using MS Access. The table has been created using the PostGIS Shapefile loader in pgAdmin. It has been encoded at LATIN1 (it wouldn't load with UTF-8 default). I ...
3
votes
1answer
64 views

Proof of part of haversine formula?

I'm trying to study how to find the distance between two points if their latitudes and longitudes are given. I have a question about the proof of part of the haversine formula given at Math Forum. ...
1
vote
0answers
26 views

How to avoid “Unable to compute a transformation between pixel/line”?

I am trying to re-project from Equi-rectangular to the NASA global EASE grid (Equal Area Scalable Earth) grid 1383 586 with a ~25 km cylindrical projection (ESPG=3410). The file is provided as HDF5. ...
1
vote
0answers
21 views

Where to find QGIS geoprocessing results?

Is there a way to access in QGIS 2.6.1 something like the Geoprocessing Results window found in ArcGIS? The History and Log window in QGIS appears to show the geoprocessing results from SAGA, OTB ...
0
votes
1answer
32 views

Select by location-arcpy

i work with arcview 10.3 on 20 mxd's (each mxd has 25 layers) and i try to do select by location (with arcpy) and want to see a layers that are visible in the current map extent only. All Other layers ...
1
vote
1answer
325 views

OpenLayers WFS problem [duplicate]

Possible Duplicate: Problems with OpenLayers and WFS - proxy.cgi issues Hi friends I have a problem with a simple OpenLayers web page. I have two layers, first one is a WMS layer and work ...
21
votes
6answers
3k views

Is GPS more accurate on specific hours of the day?

I have heard that the GPS system is more accurate, and less accurate on some specific hours on the day. If this is true, how can I get the information on when GPS is more or less accurate at my ...
1
vote
1answer
130 views

Maximum scale dependent visibility changes from 1:0 to -2147483648:1

QGIS 2.0.1 Dufour. When i open the layer properties and the scale dependent visibility is unchecked and when i check it, the maximum (inclusive) shows 1:0. I click Apply, OK, reopen layer properties ...
3
votes
1answer
57 views

QGIS Select overlapped feature

I have points that are not equal but the distance between them is so small that it can't be seen even at scale 200k:1. I calculated the distance between these points and add it as attribute. Now I ...

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