Rasters are regular grids of values, usually stored in an image-like format.
1
vote
0answers
50 views
How to get Lon/Lat values from the postgis raster type column
I have a tiff raster in my PostGIS 2.0 database. I want to get the value lat/lon and extra data like temperature from the raster type column in postgis table.
I want the table with columns ...
0
votes
0answers
15 views
Get Complete Details Of Raster Column in the Raster Table
i'm having the geotiff files containing the details of the temperature of the specific co-ordinate value along with it.
Configuration details:
Postgresql 9.2,
Postgis 2.0,
GDAL 1.9.2.
Here my ...
5
votes
1answer
186 views
How to load raster data with hyperlink path in ArcGIS MXD?
I have a problem/question and hopefully someone of you is able to help me:
I have thousands of georeferenced raster files which have corresponding polygons (outer borders of rasters) with a hyperlink ...
7
votes
2answers
691 views
PostGIS raster value of a lat/lon point
I have a tiff raster in my PostGIS 2.0 database. I want to get the value of the raster at a specified lat/lon point.
I have:
postgresql-9.1
postgis-2.0-svn with raster support
a raster imported ...
0
votes
1answer
52 views
Sextante (SAGA) “Normalisation” problem
I don't understand the SAGA-module "NORMALISATION". In SAGA Gis I just can define one MIN and one MAX value. In QGis I have to define 2 of both. How to handle that exactly?
0
votes
2answers
94 views
Grass 7 / ArcGIS 9.3 - tiff to raster
Again a Grass 7 question. I have the output of a modelling run as matlab file, which I can export as tiff and load as geotiff. OK - now can I extract the data/convert this tiff into a raster proper?
...
2
votes
1answer
87 views
How to calculate volume from a raster file?
I have a raster file containing the depth of water. I need to find the volume of water using that raster file. I need to find the area of each cell and multiply with the depth. How can I do it in ...
0
votes
1answer
39 views
How do I combine many ECW files in MapInfo?
I have MapInfo 11.5.0.16 (I don't have ArcGIS) and I am trying to combine (in some sense) a large collection of ECW files.
I can load one ECW at a time in MapInfo but I have very many. MapInfo ...
2
votes
1answer
28 views
Raster Tile Merge Performance of PostGIS 2.0
I'm attempting to intersect Australian Census boundary polygons with the 1" SRTM DEM (10.5bn points across Australia), and output the result as a single raster image on the fly.
The DEM is stored in ...
2
votes
0answers
43 views
Problem in importing raster data from PostGIS to Geoserver
I am using Opengeo Suite 3.0.2, PostGIS 2.0.3 and PostgreSQl 9.2.
I am trying to import raster data from PostGIS to Geoserver but facing an error.
I follow this tutorial link to import the raster ...
3
votes
1answer
837 views
ArcMap, Make Grids and Graticules Layer example
I'm trying to use the Make Grids and Graticules Layer tool in ArcMap (have a ArcInfo license). I'm looking for a basic example like in North America.
eg.
1.)Start with empty map
2.) Set data ...
8
votes
2answers
414 views
Extract the area of a DEM above where 60% of the region lies?
I have a DEM of a mountainous region. I'd like to extract the areas of the DEM above which 60% of the total DEM area lies. So, essentially I'd like to extract the areas representing upper portions of ...
0
votes
2answers
67 views
How to delete isolated pixels in ArcGIS 10.1?
I want to know that it is possible or not to edit the raster pixel in ArcGIS.
I want to delete isolated pixel and I want to delete some pixel by manually.
please tell me how can i do it manually or ...
3
votes
2answers
65 views
How to calculate the shared area between a raster and a shape file in ArcGIS 10?
I have a raster file with 5 classifications developed from habitat modelling algorithms. I'd like to know how much of 2 classes of the raster is covered by the network of protected areas (Shape file). ...
1
vote
0answers
37 views
Feature to Raster Conversion Results in Empty Raster [closed]
I have a simple shapefile with one feature in it with a single value (of 1). I am trying to run a Euclidean Distance on that feature, but I get "invalid parameters" errors.
So I tried to convert the ...
0
votes
0answers
17 views
Can I apply the Euclidean Distance tool for a single point feature class? [duplicate]
So, as suggested in my previous question, I tried to perform perform the Euclidean Distance tool for a single point feature class. For som e reason it doesn't work and the error given is ERROR010092: ...
2
votes
1answer
48 views
Create raster distance around a single point feature class
Okay, so I'm relatively new to ArcMap and I'm trying to use the Fuzzy membership for suitability test. I have a single point feature class that I wanna use for this analysis. I know that in order to ...
0
votes
0answers
52 views
ArcGIS opposite to pivot table
fellow GIS-ers :)!
I've been trying to find a tool to do the opposite to what the "pivot table" tool does but I dont thin there is any tools for that. I have a raster data set derived from Landsat ...
1
vote
1answer
53 views
No. of Bands in the input Raster
I have downloaded a 7.5 min DEM . Now while I am trying to mosaic them it gives me an error saying "Input and target dataset should have the same number of bands" . How can I figure out the number of ...
1
vote
2answers
44 views
Calc vs. Overlay for speeding up band math in R 'raster' package?
Regarding yesterday's question about how to speed up band math in the R 'raster' package, would it be the same to use overlay to calculate NDVI instead of calc? If that's not the case, what's the ...
3
votes
1answer
76 views
ArcGIS Raster Symbology - Break contour at 0
In ArcGIS 10, how can I break raster symbology (stretched) at a particular value (i.e. 0). For example, I have a DEM representing both topography and bathymetry and I want a break at the 0 m contour ...
17
votes
4answers
3k views
What raster smoothing/generalization tools are available?
I have a DEM that I would like to smooth or generalize to remove topographic extremes (chop off peaks and fill-in valleys). Ideally, I would also like to have control over the radius or level of ...
2
votes
2answers
46 views
Raster format to read with python
I currently have a DEM raster stored in an ESRI geodatabase. I've been asked to create a purely python (e.g., no arcpy functions) program that works with the values. Therefore, I need to convert the ...
1
vote
1answer
64 views
Copy and Paste symbology in Raster?
Hi all,
I am trying to figure it out how can I take a preserved color from a raster I already set up before and then apply the colormap to a new raster file?
Here are the details of what occurred:
...
1
vote
0answers
55 views
QGIS: Different projection result for on the fly and transformation
I am a bit confused about the result of a re-projection/transformation of a raster in QGIS 1.8 (Lisboa).
WGS84 to WGS84/UTM34N. When I use the 'on the fly' transformation the resulting raster has a ...
6
votes
0answers
82 views
Automatic detection of breaklines with a DEM
Breaklines are very useful for describing a terrain - for example to build an exact TIN.
My question is, how to extract these breaklines from a given DEM.
I calculated the curvature (vertical) - ...
0
votes
1answer
34 views
Maintain 8-bit pixel depth in Raster Calculator
Would anyone know how to maintain 8-bit pixels when computing raster calculations in ArcMap?
0
votes
1answer
22 views
ImageMosaic-JDBC Error
I'm trying to get postgis raster layers in geoserver-2.3.1, with postgresql-8.4, postgis-2.0 and gt-imagemosaic-jdbc-9.1.jar support. I'm going through the tutorial with a PNG raster that i have. In ...
3
votes
1answer
89 views
Visualizing Spatial Query
I'm new to GIS applications and trying to figure out what options I have for visualizing spatial query results that combine raster and vector data using OpenLayers/GeoExt/GeoServer/PostGIS.
A ...
3
votes
1answer
468 views
How to handle time-based raster data in the ArcGIS Server JS API
The TimeSlider functionality in the ArcGIS Server JS API is great for working with time-based vector features - you can scroll forwards and backwards through time to see the vector features which ...
0
votes
0answers
30 views
Problem with Georeferencer not scaling TIFcorrectly
I am trying to use QGIS and the Georeferencer to digitize paper maps but I am unable to get the raster to rotate afte I pick my control points. Below is a brief outline of the steps I used to ...
1
vote
2answers
76 views
Raster Calculator question for Multiple Rasters
I am having trouble for writing script in Python (ArcGIS 10.1). The task is generally divide each raster by 100. I have many of these raster files....
So what I've done is the following:
from ...
0
votes
0answers
13 views
GeoServer/Leaflet - Context menu to change raster [duplicate]
It's my first GIS project and after days of reading, it is still not clear how I should start.
I'm using GeoServer to serve GeoTiff images in WMS to a leaflet application. It works great.
Those ...
0
votes
0answers
24 views
QGIS: Unable to project raster layers correctly on a Toshiba Tecra 64# Win7
I know how to project a raster, I can do it on other machines. On this particular machine the raster loads but are no where near the correct position as if the datum is on another planet.
1
vote
2answers
46 views
Round Raster to next higher or lower int
I am using ArcGIS 10.1.
I am searching for a solution to calculate a raster.
The values are like:
0.2
0.6
5.3
i.e.
How can I now get 0.2 as 0 and 0.6 to 1 and 5.3 to 5? In the end integer numbers.
...
1
vote
0answers
35 views
GetCapabilities Request for WMS
I'm trying to connect to a WebMapServer with the Geotools WMS classes.
My problem is, that the resonse-object "capabilities" doesn't contain all layers.
When I'm doing the request in a browser, I can ...
1
vote
1answer
99 views
Resample, ArcGIS: How do I avoid resample taking into acount NoData values?
I am trying to re-sample a raster dataset to match the resolution of another dataset. I have fine resolution data on small islands (surrounded by NoData in the sea). When I re-sample the data to a ...
0
votes
1answer
49 views
How to find locations for hydro power using raster analysis?
I have a stream network and DEM file both in raster format. I need to extract values from DEM to stream network. For the analysis in stream network after that, I need to find out the places for hydro ...
2
votes
1answer
148 views
What are the units of the calculated area from a raster in decimal degree
I'm trying to calculate area for a raster file which contains 2 layers (0 for unsuitable habitat and 1 for suitable). It's been calculated successfully but I don't know what is the unit of the ...
3
votes
1answer
57 views
How to speed up band math in R 'raster' package?
I have some GeoTiff rasters with over 100 bands in total, but they are not huge: resolution is about 1200x600 and total size is less than 7 mb. I'm trying to do a simple NDVI calculation:
raster ...
3
votes
2answers
245 views
Why is Raster Layer not visible?
I have a raster dataset that is not visible in Data View, but it is listed in the Table of Contents.
I have tried viewing it in ArcCatalog but it is not visible there either.
Is there something I ...
1
vote
0answers
72 views
Raster as Attribute Field Error
I'm using Arc 10.1. I am creating a parcel inventory where I would like to have a photo of the property attached as an attribute and view-able with an HTML popup. I have a polygon feature class built ...
3
votes
0answers
53 views
Weighted Average of several raster “zones”
thanks for the visit!
Suppose I have two rasters, A and B. I want to determine the value of a certain "zone" in raster A by taking the weighted average of several other zones from raster B, that ...
2
votes
1answer
42 views
Can Geoserver return the raster value of a lat/lon point
I have a GeoTIFF published by Geoserver 2.2 and being used by Leaflet via WMS. How can I get Geoserver to return the raster value at a lat/long point?
I'm guessing it has to do with using WCS, but ...
2
votes
1answer
39 views
Nearest Neighbor Focal Statistics and Map Algebra
I would like to use a nearest-neighbor type analysis to iterate over a raster. The nearest neighbor analysis will give a cell value of 1 IF AND ONLY IF the cell being analyzed has a cell value larger ...
3
votes
1answer
58 views
Location for floorplan
Is there an application / service where I can put my floorplan of a building en 'position' it on the right place on the earth? (The buildings location).
I found TileMill an application where I can ...
0
votes
0answers
136 views
why preview image is blank for ImageMosaicJDBC (postgis raster) layer?
I follow http://docs.geotools.org/latest/userguide/library/coverage/pgraster.html to publish a ImageMosaicJDBC layer in geoserver.
the layer seems published ok and saved, but the preview of this layer ...
1
vote
2answers
434 views
QGis problem with raster transparent
I am new to QGIS. I found the problem impossible to solve the parts of raster data that are in TIFF format should be made transparent. What do I do?
4
votes
4answers
110 views
How to display a “Save As” dialog for raster files?
I'm writing a QGIS plugin in python. I need to show a "Save as" dialog window in order to allow the user to select the path of the output raster file. Do I need to create a QFileDialog and manually ...
1
vote
0answers
510 views
Conversion to Raster issue in ArcGIS 9.3.1
Trying to convert a polygon to raster in ArcGIS gives me an error... I am wondering if there is another way around to do this? I am using ArcGIS 9.3.1.
The error i am getting is number 9999 when I ...
