All Questions

4
votes
1answer
64 views

SQL “Case” statement when count(*) is 0

I am trying to write the following SQL command using case clause. with x as (select the_geom as geom from table1 where st_dwithin(the_geom, st_setsrid(st_makepoint(28.959495,41.019913), 4326), ...
0
votes
1answer
25 views

Classifying type of land use each spectral represents from remote sensed data?

How do you know the type of land use each spectral represents from an remote sensed data into a classification ? Which classification is the most typical to use when doing that ? How many ...
0
votes
0answers
14 views

Adding Raster Layer in C++ application always result in layer invalid

I am trying to add a raster layer in c++ application with QtCreator and QGIS 2.6.0. My code is as follows: QgsRasterLayer * layer = new ...
0
votes
0answers
29 views

Understanding the error term

I have some (mobile) location data from a vendor. For each user and timestamp, there are three columns: lat, long, error. I "guess" that the error means that the user is located within a circle with ...
1
vote
2answers
41 views

Calculate nearest feature with a barrier

I have three shapefiles: a) polyline with rivers and streams (also as polygon available to me), b) polylines of highways and roads and c) point file with locations in the riparian vegetation. I want ...
0
votes
2answers
29 views

ModelBuilder and Delete fields

I like to know if there is a solution to the following problem. I currently have a simple ModelBuilder workflow in which includes a list of shapefiles being copied. Within the workflow, once copied, I ...
1
vote
0answers
21 views

Calculate geographic position based on azimuth, distance and height

How to calculate the geographic position of an object in sky (like an aircraft) based on only three variables: Azimuth, Distance from home point and height of an aircraft?
1
vote
0answers
17 views

Interpreting some hydrology data

This is the historical feed of the Keystone dam for October 2014: http://www.swt-wc.usace.army.mil/chartbin/KEYSOct14.shtml Here is the real time feed: ...
0
votes
1answer
28 views

Python buffer in a line using GDAL

I am trying to make a buffer from a line using gdal. I use the example in the gdal Cookbook import ogr, os def createBuffer(inputfn, outputBufferfn, bufferDist): inputds = ogr.Open(inputfn) ...
2
votes
1answer
21 views

area elevation distribution with QGIS

I have a raster DEM and a polygon covering a part of it. I need an area-elevation distribution (i.e. how many m2 are in which elevation interval). 20m intervals will be fine. I cant figure it out.
2
votes
1answer
32 views

Identifying the side of a point from the closest polyline in ArcMap 10.0

I have a set of polylines (a network of streams and rivers) with information on the left and right side of the streams on riparian structure. I also have locations (points) of either side of the ...
1
vote
2answers
25 views

Insert values in Postgresql in Java

Hello i try to insert same values in my table but i write this code String sql = "INSERT INTO points (gid, osm_id, name, type, geom)VALUES (?, ?, ?, ?,ST_GeomFromText('POINT(?, ?)', 2100));"; ...
1
vote
1answer
19 views

Can't recreate missing address locators

My organization uses several address locators stored in SDE. The server license was recently updated, and shortly after, some of these locators simply disappeared -- they are no longer visible or ...
0
votes
1answer
11 views

opening a georefrenced image in IDL in ENVI

I am working with idl in envi,I want to use ENVI_CONVERT_FILE_COORDINATES in case of finding pixel value of specified point,for this porpuse I have lat and long data of my point but I need to open ...
1
vote
0answers
17 views

How do I apply selected features from a output group layer to the same existing group layer?

I am doing a geometric network project, and am running 3 trace process within a model to find connected features to a set location on the network. Each trace function wants to output its own group ...
2
votes
0answers
15 views

Percentage of a polygon at, or less than, a specific height (supplied by a raster)

I am using QGIS to process some LIDAR data. I need to be able to define the area of a pond with respect to its depth (i.e it is 100m^2 at 32mAOD and 500m^2 at 33mAOD). Is there a way of finding the ...
2
votes
0answers
20 views

QGIS returns “invalid layer” when adding a WMS layer

I want to add a WMS layer in my map. I select the server and obtain the list of layers that are published there. I select one of them (the problem is the same with all layers), but QGIS does not load ...
1
vote
0answers
27 views

how to use line feature as stops input in network analyst?

I'm trying to build a certain route with network analyst on a Network Dataset. As an input to create the route I want to use line features. I am trying to do this with network analyst in ArcGIS 10.0 ...
0
votes
1answer
22 views

Is it possible to join points to a polygon in MapInfo Professional v10.0?

This is what I have... ... and I would like to assign the points to the polygons that they belong to. In ArcGIS this is accomplished fairly easy through using Spatial Join, but I have no clue how ...
1
vote
1answer
31 views

How do I make my map use a set of coordinates

Right a little background. I've made a custom google map with the google map api which has a few functions that work well within it - one specifically is limiting the user on what they can view within ...
0
votes
1answer
44 views

How to link a shapefile with points to a shapefile with lines?

I have a shapefile with points (nodes) and a shapefile with lines (pipeline) which I have extracted from a water distribution network. I have been able to transform the points into the right ...
1
vote
0answers
10 views

How to merge DMAs using QGIS — Creating Custom Regions?

What I am trying to do might seem basic, but bear with me as I am just hacking my way through a lot of this space. What i am trying to do: I am trying to create a new .shp file of custom regions. ...
2
votes
2answers
53 views

spatial join based on field

it's my first time that I'm posting here and I hope, that somebody can help me. I already tried to find the solution for my problem in any of the previous answers for similar problems, but none of it ...
1
vote
1answer
20 views

Prepare raster data for wms using geoserver!

I have some orthophoto of different resolution (urban 8cm pixel, hill 20cm pixel, mountain 35 cm pixel) which cover an area of 28000 km2. Those are in jpg format, already georeferenced. I need to ...
0
votes
1answer
24 views

Problems applying a mask in Geostatistical IDW

I'm finishing an analysis of approximately 850 archaeological assemblages in the Mediterranean, and I've successfully run IDW in Geostatistical toolbox (ArcGIS 10) to generate the results I like. I'm ...
1
vote
0answers
9 views

What is the source of a “TabletPC inking error code. RtpEnabled called multiple times” error from within ArcMap?arcm

I am attempting to remotely troubleshoot an issue with an ArcMap AddIn (.NET 4) that I wrote where the users (only a couple of them) are receiving this error: TabletPC inking error code. RtpEnabled ...
0
votes
1answer
32 views

Configurable Map Viewer (CMV) - Configure dynamic layer to not display all sub-layers?

Using the example below, from the CMV, what would be the best way to not show the Fire Stations layer in the Louisville Public Safety map service assuming I wanted to see everything else and I wanted ...
3
votes
2answers
47 views

Influence of the scale factor on the projection

I'm currently reading documentation about map projections to understand the source code of the Proj4 project. The scale factor is named in a variety of sources I read. This sources explained its ...
0
votes
1answer
17 views

Loading Satellite Imagery Into Trimble GeoExplorer

How would I go about loading satellite imagery in TIFF format as a background file or image into my Trimble GeoExplorer?
0
votes
1answer
17 views

Preferred method to submit edits to open Street Map OSM

As of this date (Nov 2014) what is the preferred method to submit edits to the Open Street Map OSM project? I have read up on a few options but prefer the easiest Actually any info on the process ...
1
vote
1answer
37 views

Modifying “pg_hba.conf” file to listen local TCP/IP conection

I am starting with PostGIS and there is an error when trying to connect through a TCP/IP connection. What I have done is: installed PostGre 9.3 in my PC, then installed PostGIS 2.3 for postGre 9.3, ...
2
votes
1answer
25 views

QGIS print composer, DMS grid when SRC is not in decimal degrees

I have a QGIS project where the layers are in projected SRC, and when I go to the print composer to draw the grid, the units are in millons of meters, and I want them in decimal degrees. Is it ...
1
vote
1answer
26 views

J2000 to WGS84 in QGIS?

How to transform Earth-Centered Inertial J2000 CRS to WGS84 CRS in QGIS? I searched J2000 in spatialreference.org, however nothing found. I don't know the proj4 string of J2000. Any advice would be ...
0
votes
0answers
13 views

Tagging non-georeferenced photos to point layer in arcgis server

I would like to publish a point layer (approximately 100 features) representing some locations and at the same time I have same number of pictures from those locations which I want to tag them with ...
0
votes
0answers
15 views

In Mapbasic, How to populate my table row data in a dialog box with RadioGroup and EditText

Good day! Im trying to pupulate my table row data in a dialog box with Radiogroup and editText control. I successfully get the column value list from popupMenu control after selecting the table and ...
0
votes
0answers
5 views

I want to query only the consecutive Offset

I have some offset points along a river and I query after spot ... only the points that have the elevation(spot) with 20 m more that river line (offset=0). But now I want to query only the consecutive ...
4
votes
2answers
37 views

Software for amateur topographic surveys

I'm interested in doing rough topographic surveys using my tripod-mounted Brunton transit compass for azimuth readings and laser rangefinder (and maybe an optical level), so obviously going to be much ...
1
vote
0answers
17 views

How can i change time units of direction window in ArcGIS network analyst?

I want to change direction window unit from minutes to seconds . I set travel time unit to second and the result of the direction window show second but the unit remains min .For example in the ...
0
votes
0answers
19 views

How to display grouped value of report horizontal and not vertical in ArcGIS 10?

I generated a report using Arcgis with 2 fields, grouped those by one of the fields. Need: By default it generates the report vertical, i need to generate horizontal and the values to be divided by ...
1
vote
0answers
20 views

How do I generate a drainage area-slope scatter plot from ASTER GDEM data

I have ASTER GDEM catchment data. I've installed the TauDEM tool. How do I generate a Drainage Area-Slope scatter plot?
0
votes
0answers
7 views

Can't find assembly ref for Mapguide.schema.FeatureSource

Error in missing Asembly reference for using OSGeo.MapGuide.Schema.FeatureSource; // Build the feature source object model FeatureSourceType fsType = new FeatureSourceType();
-1
votes
0answers
14 views

Change Coordinates in GeoJSON with geojson-jackson

I have .geojon files that look like this: { "type": "FeatureCollection", "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } }, "features": [ { "type": "Feature", ...
0
votes
0answers
17 views

How to correctly uncompress and re-compress an msd file using 7zip from command line

I am trying to uncompress and recompress both the msd and sd file so as to tweak some things I want. In fact I want to get inside the layers folder and for each layer.xml file to string replace the ...
0
votes
0answers
9 views

How to use linear referencing in Informix DB with Spatial Blade?

Is there any simple solution to use linear referencing in Informix Database with Spatial Datablade?
4
votes
3answers
223 views

Is there a standard for the coordinates of pixels in georeferenced rasters ?

We are working with different raster datasets, and the pixel coordinates are either stored at the center of the pixel or at one corner. The information is usually provided in the metadata, but ...
0
votes
1answer
32 views

How to save time without date in shapefile's DATE filed using ArcGIS 10.2?

I am trying to save a time in a shapefile's DATE field (without a date, because shapefile can only store something one simultaneously - date or time). I use field calculator with PYTHON parser. I am ...
0
votes
0answers
43 views

How to style mapboxgl point source

I have created a simple mapboxgl map, and I am adding a source that contains point data. I am trying to then apply a style to the data. The approach I am taking works well for polygon & line data, ...
0
votes
0answers
11 views

How can I compare the orientations of two lines, or a line and a polygon?

I am trying to estimate valley width. I have calculated bounded rectangles (by width) of subcatchments and also the alignment of highly simplified stream segments within these subcatchents. Now i am ...
0
votes
1answer
22 views

Convert geography to geometry in H2GIS?

In H2GIS, geometry can be converted to geography with function "ST_Transform" For example: SELECT ST_Transform(ST_GeomFromText( 'POINT(584173 2594514)', 27572), 4326); -- Answer: ...
1
vote
0answers
17 views

Geoserver SLD external graphic path

<Rule> <PointSymbolizer> <Graphic> <ExternalGraphic> <OnlineResource xlink:type="simple" xlink:href="glass.png" /> ...

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