All Questions
0
votes
0answers
2 views
Log Transform of Flow Accumulation
I have run a flow accumulation for a DEM that I'm working with. I'm trying to apply a log transform because I've heard it could give a better visual representation.
How would I go about doing this ...
0
votes
0answers
3 views
convert XML to PostgreSQL using MATLAB
In a weeks time I should be able to transfer the GIS data provided in the XML format to PostgreSQL database. I have prepared the PostgreSQL database (empty) and looking at Matlab scripts. (I am on ...
0
votes
0answers
7 views
Why does clip only return the top polygon?
I'm running the command below on a data set with many stacked polygons. This is a county standard so I can't change the way they manage their data. Each type of polygon can be uniquely identified ...
0
votes
0answers
5 views
How to create a barrier feature class to use in a geometric network?
I am working with the NHD and need to isolate stream segments upstream of barriers. I have too many barriers (thousands) to do this manually using the Geometric Network barrier tool on the toolbar.
...
0
votes
0answers
7 views
Calculating rows in a attribute table of a point shape with QGis or Saga
I have a point shape with an attribut ("test"). I need to calculate the sum of the 1st four (id 1-4) "test" values and then the next 4 (id 5-8). Is there a chance to calculate this with the field ...
0
votes
0answers
5 views
ArcGIS Runtime for WPF basemap disappears when zoomed in
I have a problem where the http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer basemap is disabled and the images are removed when you zoom in to a large scale. I've set ...
-1
votes
1answer
22 views
Copy/ Paste from spatial attribute tables into non-spatial tables in Arcmap
Imagine I have a shapefile which has its own attribute table and I have a non-spatial stand alone table too. I am going to copy the rows from the shapefile attribute table into the stand alone table ...
0
votes
1answer
15 views
Why this two datasets don't match?
I have a postGIS database in SRS 4326 (WGS84) with several Europe layers working well, but when I load a shapefile projected to the same SRS with QGIS, the layers don't match.
To explain it better ...
0
votes
0answers
4 views
change content div on layergroup change
I have two layers in a LayerGroup that I can toggle between and would like to update a control(bottom left in example) with the grades of the currently selected layer. How can I go about doing this in ...
1
vote
0answers
11 views
Can an external application start ArcCatalog.exe and immediately navigate to a specific folder?
I'm looking something similar to explorer's command line switches:
explorer.exe /select,c:\examples\condensed\need\obtains\dispute\under\billion\floor
or
explorer.exe ...
0
votes
1answer
8 views
How to connect “floating” model variable to the tool that uses the inline variable?
This question likely has a simple answer or the behaviour is by-design and is not worth fixing.
The simple model below uses an Expression to 'Select Layer By Attribute." When this model is run, the ...
0
votes
1answer
5 views
Animate a Choropleth Map in CartoDB?
I used Torque to animate points over time in CartoDB
I have a map of polygons and I want to animate the changing colors.
Over five years the intensity of the type of incident I'm mapping changes. I ...
0
votes
1answer
6 views
Question about ERDAS TOC
On occasionally when I open a raster in ERDAS 2013, I get white or yellow circle icons on my ERDAS Contents and tried to find information on ERDAS.
I want to know what does the icon mean ? Thanks ...
1
vote
2answers
26 views
What GIS applications and services have been affected by the Heartbleed vulnerability?
Heartbleed is the name given to a recent, very severe security vulnerability in the OpenSSL library, used in a large number of websites and applications. It is being called one of the worst computer ...
1
vote
0answers
5 views
Can QGIS2 refresh layers without the need to reclassify each layer individually?
I have a set of layers which I'd like to have refreshed each time I open QGIS2.2.0 (Windows 7). Each of 14 layers (polygons) is linked via a join to a csv file with no geometry. The layer displays a ...
1
vote
1answer
18 views
Arcgis 10 assign values to field based on values in other field
I have a table with two fields A and B, and i want fill field B with "some values" from field A:
FieldA:
123456_CC;
123_D;
1234567_AB;
123456768_F
I just need the "text" that is associated with the ...
0
votes
2answers
24 views
Change field map properties in ArcMap
I am trying to import csv files in ArcGIS to do a join. However, some of the fields are identified as double, some as long and some as long. Therefore the join results in bunch of columns with NULL ...
0
votes
0answers
5 views
Mapnik: GeoTIFF flipped (mirrored vertically)
I generated a GeoTiff using the QGIS HeatMap plugin and want to render it on top of some OSM data. The problem is that the raster gets rendered upside-down in the output. Can someone point me in the ...
0
votes
0answers
7 views
Relationship between MS Access DB and Google Maps API/Fusion Tables
We are having an issue with a project that we are working on using Google API and M.S Access. Our project goal is to design a web map in Google API where we can select a parcel of land and have all of ...
0
votes
2answers
18 views
Get srid from a shapefile using ogr
I'm writing a script to import shp to postgis,
using python, osgeo and psycopg2
( see my previous question:
Import shp to Postgis using Python and ogr )
I'd know if there is a way to get by osgeo ...
0
votes
1answer
14 views
1:250 streams data - USA wide - where can I find it?
I have 1:250 streams data for a few western states. I find this scale to be excellent in many settings as base hydro data.
I have never been able to find a USA or better yet, NA wide dataset of this ...
0
votes
0answers
11 views
How do i create a distributive flow line map showing movement of passengers from a bus terminal to several destinations?
I'm writing my final year B.Sc thesis on transportation (pattern of passenger flow from a bus terminal to several destinations). I intend 2 use a distributive flow line method of spatial movement ...
0
votes
0answers
3 views
Gdalwarp script misbehaving in Qgis 2.0, size increasing
My code:
mask = str(shpLayer.source())
output = "C:/Users/.../crop.tif"
inputt = str(rasterLayer.source())
subprocess.call(["gdalwarp","-q","-cutline",mask,"-crop_to_cutline",inputt,output], shell = ...
1
vote
0answers
11 views
How can we generate GeoJSON from SQL data with latlong
Is there any way we can create GeoJSON from SQL server table with Latitude & Longitude Data?
0
votes
0answers
14 views
Petroleum Emergency Management GIS Project Topics? [on hold]
Does anyone have any good websites for emergency management GIS projects, or have any inputs towards a dissertation topic within this field, specifically towards the petroleum industry? Is a project ...
1
vote
0answers
25 views
GIS Real Time Information Dissertation Topics [on hold]
Does anyone have any good websites for real time information GIS projects, or have any inputs towards a dissertation topic within this field? Where does one for instance find useble data for such a ...
0
votes
0answers
4 views
How to customize layer context menu for a specific ArcMap project?
Is it possible to customize group layer, feature layer, raster layer and table context menus in the TOC for a specific ArcMap document (VB.NET)? The goal is to add custom tools, specific to the layer ...
1
vote
0answers
11 views
qGIS' Database Manager “Load as New Layer” Option Not Working
I'm trying to visualize some of my database queries on qGIS. I run a valid SQL query which returns a subset of my table that should be easily loaded as a layer. I then check "Load as new layer," ...
0
votes
0answers
7 views
Make a raster with pixel scale 100 by 100 meter with gdal_rasterize
I'm asking here, because, I've got great results last time. Here it is the next of my adventure with gdal_rasterize, I want to make a raster picture where each pixel correspond to a square of 100 by ...
2
votes
2answers
102 views
Merge 30000 polygon shapefiiles in a logical manner in ArcGIS model Builder
I have 30000 shapefiles (a1.shp to a30000.shp). They are all polygons. Each polygons has one and only one polygon feature in it. I need to Merge the polygons into 1000 shapefiles. My output would be ...
3
votes
1answer
16 views
Update/refresh edited PostGIS table in QGIS
I imported a PostGIS table (with geometry) from my PostgreSQL database as a layer in QGIS.
Later, I edited the table using PostgreSQL UPDATE commands.
Is there a way to quickly update (like a refresh ...
0
votes
0answers
17 views
Consult the charts of a line
I have a table of bus lines and other bus stops in PostGIS.
Are conformed to the image below, the lines and the stops on the sides.
I want to relate the lines with parades through a spatial query.
...
0
votes
2answers
9 views
OpenLayers - How to construct OpenLayers.Bounds
I would like to create Bounds for a layer but I am not sure in what order I have to provide the min_x / max_x and min_y / max_y coordinates.
is it correct to put it in that order: min_y, min_x, ...
-1
votes
0answers
19 views
Need to make a 'donut' then put that in a featureset [duplicate]
I am hoping the minds here can do much more than ESRI support ever could. :)
I have the need to apply a delay to a raster map for movement through water by ships. The delay example would be a lock ...
0
votes
0answers
12 views
Don't cancel the click event on a SelectFeature
On my OpenLayers map I have a custom Control that has a ClickHandler. I also have a SelectFeature on one of my layers.
I need the ClickHandler to fire even if a SelectFeature is clicked.
I tried:
...
0
votes
0answers
25 views
Clip tool not working: 000735 error?
I am trying to use the clip tool. When i select it from the list, a window opens however it is greyed-out. i cannot enter any imput or clip features. 'Environments...' does not allow me to select any ...
1
vote
1answer
16 views
How can I specify the ranges in the gdaldem's color configuration file?
I want to render an IMG file according to a specific renderer, and export to a jpeg File. I have asked a question about this, and got a satisfactory answer.
The issue now is that I need to write a ...
0
votes
0answers
7 views
How to add the attributes of selected features to my new layer in pyqgis
I am trying to create a layer from the selected points coordinates. I am drawing a circle to the coordinate of selected points. I also need to add initial attributes of my selected features to my new ...
1
vote
0answers
6 views
How to get full 16 bits range using RasterSymbolizer and ColorMap ramp?
I am attempting to get the full 16 bits values of my DEM (stored as TIFF files) rendered in WMS tiles (png format).
For this I use GeoServer 2.5 and a RasterSymbolizer with a ColorMap of type "ramp".
...
0
votes
0answers
10 views
Myanmar Datum 2000 information
Does anybody know where I can find the technical details for Burma's latest datum? It's called Myanmar Datum 2000 and I can't find any details online. I need the details to create a custom datum on my ...
0
votes
1answer
11 views
All UK census geographies in one file irrespective of scale
Is it possible to get all UK census geographies in one file?
For example, I am currently looking at a table of data titled
Life satisfaction by country, region, unitary authority and county, April ...
0
votes
0answers
13 views
Problems with projections in QGIS 2.2 on a Windows Vista? [duplicate]
I use QGIS 2.2 on Windows 8, and the same QGIS 2.2 has been installed on a computer with Windows Vista.
On the Windows 8 everything works just fine, but something is wrong on the Windows Vista.
All ...
0
votes
0answers
10 views
Trilateration Math Check
I'm trying to crate an indoor trilateration program working off of N BLE objects. Where I have any number of beacons in a room and my ipad can track its location within them to a sub meter degree of ...
0
votes
0answers
11 views
processing with xslt-
on opensuse 13.1 i try to do some gis-works with a large file: france-latest.osm.bz2
which i gathered from here: http://download.geofabrik.de/europe.html
what do i do with that file ...
0
votes
0answers
13 views
OpenLayers GeoJson style
I have a GeoJson that I'm displaying in OpenLayers. I created a style map and added it to a layer. The problem is that in GeoJSON I have two types of features - Points and Linestring. And they both ...
1
vote
0answers
15 views
Changing user's password and adding users in Geoserver using REST service
I want to change user's password (e.g. for admin user) and create a new one using Geoserver's REST API. Is this possible? I tried to look for some solution in their DOCUMENTATION, but nothing found ...
4
votes
0answers
25 views
How to compare two Geodatabases
I would like to compare the data of two geodatabases, in SDE or a file geodatabase, to detect the changes occured between them , i've tried to compare the Xml workspace document of both databases ...
0
votes
0answers
5 views
Difference between Microstation and FME coordinates transformation
I'm trying to transform dgn v8i files and oracle database from NTF-Lambert 2 Centre to RGF93-CC45.
I want to use Microstation to convert my dgn files and FME for my database.
Both software use the ...
1
vote
1answer
26 views
How to find the problem with my mapserver test page?
I am trying to create a test page with mapserver and shapefile. At the moment I just want to get the map shown on my test page.
I have gotten the EXTENT coordinates by opening shapefiles with QGIS - I ...
1
vote
1answer
43 views
How can I group Points to make polygon via Python
I have an array of coordinates
Point= [lat,long]
ListPoint= [[38.203655,-76.113281],[38.10,-76.12],..]
I wanna make a polygon that contains all these points ? There is a project developed by ...
