1
vote
0answers
24 views

Undefined symbol error when creating postgis extension

When trying to create postgis extension, I'm getting an error, no references in google on it. maptest=# CREATE EXTENSION postgis; ERROR: could not load library "/usr/pgsql-9.3/lib/rtpostgis-2.1.so": ...
1
vote
1answer
53 views

Calculating real surface area using Zonal Statistics as Table Tool?

I have a slope dataset. I have a polygon shapefile with territory within the extent of the slope map. how do I calculate the real surface area of this shapefile using the zonal statistics as table ...
1
vote
1answer
14 views

Profile curvature and soil moisture correlation: issue in interpretation

I have a question related to the profile curvature values. In an article I was reading (reference provided at the bottom of this question), scholars have found a negative correlation between profile ...
-3
votes
1answer
37 views

Multi-threading on ArcGIS 10.2 for Desktop home PC? [on hold]

This Q has been asked before but it has been a couple of years since it has been answered. Is ArcGIS 11 going multi-thread? Can't get affirmative answer---other than background geoprocessing. So, ...
1
vote
0answers
10 views

Creating batch file from ERDAS IMAGINE Spatial Modeler?

How to create batch file from the ERDAS IMAGINE Spatial Modeler? I want to do the same process to different input images, something similar which we can do by batch processing of the existing ...
1
vote
0answers
15 views

How to remove ArcGISTiledMapServiceLayer completely

I have a problem related to "ArcGISTiledMapServiceLayer". I have an ArcGISTiledMapServiceLayer map service, which I have added to Map object. This service work as BaseMap. Now I want to add another ...
1
vote
1answer
16 views

Can I set individual scale levels for an ArcGISDynamicMapServiceLayer?

I have a map service that contains 6 layers. I turned one layer into a feature layer. I used this layer in a query and show the result. I then would like to just show the other 5 layers as a ...
-2
votes
0answers
16 views

how can i obtain mean of 30 bands from the help of raster calculator in QGIS API with python? [on hold]

class BankAccount(object): def __init__(self, initial_balance=0): self.balance = initial_balance def deposit(self, amount): self.balance += amount def withdraw(self, ...
1
vote
0answers
41 views

How to create a rainfall raster from rainfall contours?

I downloaded a free rainfall data from the Philippine GIS Data Clearinghouse (PhilGIS) which are vector lines. How can I extract the data points from this? I want to extract it because i will be ...
1
vote
0answers
27 views

Converting DEM data to height information in meters using QGIS?

I'm relatively new with QGIS and currently I'm working with ASTER and SRTM DEMs. The goal is to create vector heightcontours with labeling in meter. Can you tell me how I can convert the grayband ...
2
votes
1answer
26 views

Efficient way to provide cached tiles? [on hold]

I am creating an app in Android that requires cached areas. I allow the user to cache an area of reasonable size. The server provides these tiles in a zip in the format /z/x/y.png. I took a (very) ...
1
vote
0answers
14 views

Clip Aerial Image Pair by Overlapping Area?

I have a set of aerial images which I am trying to clip by their overlapping areas, for use in a more involved program I am writing in Python with Python Imaging Library (PIL). Is there a command ...
1
vote
0answers
26 views

Raster Calculator

I have a slope dataset. How do I calculate the real surface area for this slope dataset using the raster calculator. This is the example I was given: orthogonal area of a raster cell in square ...
1
vote
0answers
25 views

Showing Google Maps using ArcObjects?

Do you know how we can show Google Maps as a base map in arcObject stand alone map? For example is there any wms address from google map that we can use it to connect to it or somthing like that? I ...
1
vote
0answers
22 views

Automatically generate & display distance to nearest polygon-feature?

I´m working on data driven pages and I´m searching for a way to automatically generate and display the distance to the nearest polygon-feature in the map. It should be shown as a line from the ...
1
vote
0answers
20 views

How to sort a column in attribute table programmatically

Is there any way to sort ( alphabetically ) a column in the attribute table programmatically (without clicking on the column header) in QGIS ?
4
votes
1answer
56 views

Advantages of R-trees in comparison to geohashes

Geohashes are being widely used in products like: Lucene, mongodb, etc and have become one of the most important technology of present day. Have Geohashes replaced the good old R-trees or do R-trees ...
1
vote
0answers
27 views

Modifying properties of Attributes Table in QGIS?

In my QGIS project I'm using vector layers that require a lot of data inputting/editing. The problem is that some of the data I'm inputting varies greatly in matter of length and structure (various ...
2
votes
3answers
47 views

What is the opposite of height? [on hold]

Considering that depth denotes the distance below sea-level to a point on an object located below sea level, and considering that height denotes the distance to some point above the surface of the ...
1
vote
0answers
15 views

Creating a marker proportionally offset along a line in QGIS 2.4 when re-projecting

One of the nice new features in QGIS 2.4 is to be able to offset markers (e.g. arrow heads) along a line as part of the styling. I am trying to display a dataset of simple lines (not polylines) with ...
3
votes
1answer
29 views

Where i can find Mapbox tiles gallery

I'm sorry, if my question seems to be newbie, but i have discovered that cloudmade tiles service has been discontinued, so to switch to mapbox tiles, i imagine that i can find a gallery (like in ...
1
vote
1answer
24 views

Algorithm to find geohashes which satisfy query condition

I have an application where I need to query geohashes by specifying the bounding rectangle. Since geohashes map 2D to 1D is there a method by which I may find the prefixes of all geohashes which ...
1
vote
1answer
25 views

How to calculate Distance, Azimuth and Dip from two XYZ coordinates

I have two XYZ coordinates and I would like to calculate the Distance, Azimuth and Dip between them. I have come across a similar question on this site that calculates it the other way around (with ...
3
votes
2answers
155 views

Best Landsat-5 TM band combination for detecting fire scars

I am looking for the best band combination with Landsat 5 imagery to detect fire scars.
1
vote
0answers
10 views

Displaying a box with text on a leaflet map

Is there a way to display a label or textbox on a specific geo-place on a map produced by leaflet.js.? I know about the Marker- and Polygon Method But I can't find a way to put text in the polygon. I ...
1
vote
0answers
10 views

r.stream.* commands do not work in qgis environment

I have been working for a while with some grass commands in QGIS environment (r.watershed, r.terraflow, r.thin, r.to.vect etc) with out any problem. I haven't been able to get any results at all from ...
3
votes
1answer
74 views

PostGIS: Insert a Point using Python

What is the right way to insert a Point to a PostGIS database using Python?
1
vote
1answer
36 views

Use Ushahidi api in another map using openlayers

I have a ushahidi deployment and i am using Openlayers + ushahidi api to show the reports in a separate map along with other features. i have queried the data from ushahidi api and made a vector ...
3
votes
1answer
28 views

Wrong scale when importing dxf into QGIS

Has anyone had the problem that the scale of the shp layer converted originally from a .dxf file turns out to be wrong? (for example I draw a line of 10 meters long in AutoCAD and imported it in QGIS, ...
1
vote
1answer
34 views

Extract lat, lon Points from Polygon

I have PostGIS database, and want to extract lat, lon pairs sequence from Polygons (and MultiPolygons). As a very fresh PostGIS user, I'm able to just extract the Polygons: SELECT ...
1
vote
0answers
29 views

from shape files to a database

I've previously converted simple shape files to WKT so that I can store them in RDMS that has spatial capabilities. I'm a new user to QGIS, which I'm using to browse a shape file. But now I have a ...
0
votes
0answers
10 views

Raster Analysis Grid (Interpolation) Crashes

Upon clicking on "Grid (Interpolation)" QGIS crashes. I running QGIS 2.2.0-Valmiera on a Mac with OS X 10.9.4 Thank you for any trouble shooting guidance
1
vote
0answers
31 views

Polygonize Missing Polygons

Polygonize is not capturing all of the pixels in an image that has been converted to 0s & 1s. The pics below show -original geotif -geotif recalculated to 0s & 1s -polygonize output As the ...
1
vote
1answer
43 views

Geodjango - trying to get points within a polygon

Edit: I think my problem might be that my data sets include shape_length and shape_area data instead of lat/long(which are included in the World Borders) so I think I need to convert it somehow... ...
0
votes
0answers
22 views

Are there reference manual pages anywhere for QGIS built-in “buffer” and plugin “points2one”?

Perhaps I am missing some quick pop-up help mechanism, but as a relative newcomer to QGIS (having cut my teeth on ArcGIS 10.1), I am struggling to find reference manuals (i.e. explanations of all ...
0
votes
0answers
8 views

GRASS GIS for geological mapping [on hold]

Has anyone used GRASS GIS for geological mapping? I am trying to perform multispectral processing on open source GIS platform as I don't have access to ENVI software. Does anyone know a way to do ...
2
votes
0answers
22 views

Encoding Greek alphabet with ArcGIS for Desktop?

I have a big type of Greek shapefiles, but a lot of time when I show the attribute table I see ?.????????? . How can I encode them? Is there any way to make ArcGIS 10.1 for Desktop encode them ...
1
vote
1answer
16 views

create a vegetation mask using Landsat 7 [on hold]

I'm working on a very large study area. The aim is to create a vegetation mask representing only pines. I'm using Landsat 7 images. Since the recordings were made in the winter it's pretty easy to ...
0
votes
0answers
16 views

Performing distance analysis and mapping collection site? [on hold]

I need generic advice on below for my semester project. We are not taught any GIS suite formally, so I went through very basics of ArcGIS 10.2, which I also have access to. May I request advice on ...
0
votes
0answers
21 views

What are Mapnik, GeoServer, CKAN, GeoNode, GeoNetwork?

I'm trying to get a clear view of the roles of different components here, this is not a "which is better" comparison, these components have different roles, but their functions overlap. (Comparison ...
1
vote
1answer
13 views

Retrieving routedescription geometry as GeoJSON

I'm building a small web-map and would wich to display a polyline representing a specific route via roads. With leafletjs it is easy to display the geometry on/over the map. So that's not the problem. ...
1
vote
1answer
44 views

How to “lower the resolution” of a lat long csv

I have a csv with 12.5 million date/lat/long/value points, it's a point every 800 meters ( in a grid ) of the united states what's the best way to convert the points to every 1600 meters? or 3200? ...
3
votes
0answers
24 views

Algorithm for estimating position of many objects and differentiating those?

Let's assume a crowd-sourced tree location use case where a research team asks hikers to GPS the location of a specific tree type in case they encounter it. This will lead to a large number of ...
2
votes
1answer
73 views

Check if line crosses a polygon

What I'm trying to do is with JSTS to check with lineGeom.crosses(polygonGeom) function if a line is crossing completely a polygon. The problem is that both cases from the picture returns true. I ...
1
vote
1answer
26 views

Loading GRASS gives error installing QGIS Chugiak on Windows 8.1?

I am experiencing a problem installing QGIS 2.4 Chugiak on Windows 8.1, resulting in a error loading Grass. This may be a problem only affecting certain installations, I'm not sure. I am a noob on ...
2
votes
1answer
47 views

data source for worldwide cross-sections of topographic and bathymetric for woodworking art project?

i am a decent r programmer and statistician, i am able to work with data sets pretty well. i am less familiar with GIS tools, but if given a shapefile i can certainly plot political borders and ...
0
votes
0answers
16 views

Show graph in html popup for dynamic data of a postgresql table

I am trying to plot xy value from a postgresql database table. In the table there are multiple longitude and latitude corresponding to values. The table is like this, where all longitude and ...
1
vote
2answers
25 views

Looking for tool to start ArcGIS for server 10.1 services automatically

Is there any tools or scripts to start ArcGIS server 10.1 services automatically when the services are stop? Thanks
1
vote
1answer
18 views

How to add labels parallel to lines, polylines or multilines using Leaflet?

I want to add road name parellel to its line or if the line is curved, then the label should also be curved. How to add these name labels using leaflet? example image
0
votes
0answers
38 views

Python + GME (Spatial Ecology) + Subprocess.call

I'm trying to run the following code to use GME commands in Python. import arcpy,os,subprocess from arcpy import env env.workspace=r"D:\Users\myname\Desktop\aviso" count=0 for raster in (f for f in ...

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