A layer in a raster dataset.

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1answer
25 views

Importing TIF raster in QGIS, default color band

Where can I change the default color bands for importing raster images? When I import a TIF image the green color band is not set causing a purplish image. When I set it in the properties it views ...
1
vote
2answers
65 views

Is it possible to split a picture taken with a regular digital camera into real spectral RGB channels?

I have no idea how the sensors inside a camera work. I know I can take jpeg and separate the R, G and B channels but I have no idea whether these channels are the real red, blue and green in visible ...
0
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1answer
125 views

Using Python function in ArcPy script?

I have an script to transform DN into Reflectance of each band of several images. The unique variable of the equation, apart of the Band itself, is the Divisor: (B1 - 1) / 508 (B2 - 1) / 254 (B3 - ...
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1answer
28 views

How to change band type?

I have an hillshade tiff for which the current band type=Bytemay be problematic. How to change the band type to type=float ?
2
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0answers
68 views

Python Script to iterate numerous, single-band rasters for arcpy.CompositeBands

I have a large collection of single-band geotiffs (NIR, Green, and Red) that I would like to composite using a Python script. The goal is to iterate through multiple folders in a main directory, ...
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0answers
15 views

Changing color of multispectral Raster Image using PostgreSQL/PostGIS query

Would like to change the color of a multispectral Raster Image. looking for changing band rendering values for Red, green and Blue bands using PostgreSQL/PostGIS query. I have loaded the raster ...
1
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0answers
87 views

Best band ratios in Aster data?

I am interested in the determination of lithology by using ASTER band ratio. I try to a lot of band ratio (for example RGB 4/8, 4/2, 8/9) but I didn't get a good result. Do you think what is the best ...
0
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2answers
469 views

How to read and write tiff image and locate pixels and bands of images in R

I'm new in R I want to know how to read and write tiff format image in R and how to use R to locate pixels and bands of images My environment is in Windows when I try to read tiff image it shows ...
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3answers
60 views

PostGIS raster maximum number of bands?

Is there a limit on the maximum number of bands you can store in a postgis raster? I cannot find documentation on this. As far as I can remember, a geotiff allows up to the max short integer (so ...
1
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1answer
47 views

Band Issues in Quickbird Satellite data

I procure data from DigitalGlobe (Quickbird Satellite data) for different periods hence data having some different band combination. I have attached an example image to show the problem. I am looking ...
1
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0answers
134 views

Python Band.SetNoDataValue(), sets all bands at once

Can someone tell me what I am doing wrong? I want to set bands 1 and three to 255, and band 2 to 0. The code below only should only set band 2, but gdalinfo shows that all bands get set to 0. Ubuntu ...
0
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1answer
53 views

How to get MODIS data with 3 band and step to change hdf file to colored map ?

i just convert hdf file to tiff with MRT but my result is grayscale map,How to get MODIS data with 3 band and step to change hdf file to colored map ? thanks
2
votes
1answer
305 views

Best Landsat band for forest classification?

Using Qgis and the Semi-Automatic Plugin for Classification, which are the best Landsat bands to use to classify trees species (in central Argentina)? In Landsat 5, 7 and 8?
2
votes
4answers
803 views

Determining which “color” each image band represents?

I have a satellite image that has a few bands in it. But I don't know what colors they are supposed to represent, nor do I know where to look for this information--the file's metadata say nothing ...
0
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2answers
201 views

ArcGIS 10 - mosaic: creating 4 files (rasters)

using the Mosaic to new raster tool in order to merge two satellite images, ArcGIS 10 created 4 different files: the coloured image and image1, image2 and image3 (all BW), which are, I guess, three ...
0
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1answer
45 views

How to select a specific area (in a polygon form) determined by some value range in a raster band?

For example, I want create a vector layer with polygons that represents all areas where the elevation is between 500 and 600. Someone has any idea to help me? I'm using PyQgis 2.2.
2
votes
1answer
240 views

How can I extract only band 4 from a geotiff multi bands to create geotiff or AAIgrid with this band using Python?

I have a geotiff file with many bands... I will like to create a .asc file or tiff file by converting only one band from the geotiff file. I don't find the solution by using python... With ...
0
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2answers
68 views

Rasterization in different bands

I have a set of vector based shape files, representing different types of ground coverage in a city (for ex: roads, buildings, open field,...). For the algorithm that I want to run on it, I need just ...
0
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1answer
131 views

How to isolate certain raster values using raster calculator?

I have a one band grayscale image. It has values 0-63 within the band. I need to isolate some of those values. Is there a way to do this in the raster calculator? QGIS 2.2//Windows 7
0
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1answer
49 views

Changing band for greyscale in plugin

I am trying to make a qgis plugin to change which band in a multiband data set (netCDF where the band represents time steps) is used for a grey scale rendering. The file works fine with manual ...
2
votes
3answers
2k views

How to extract one band from a three band raster in ArcMap?

I'm fairly new to ArcGIS and I get into trouble extracting a single band layer from a raster image .img in ArcMap that I want to use after in zonal statistics. So far, all help I found is to do the ...
1
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1answer
157 views

How to do separability analysis in eCognition?

Can I use eCognition to check which bands are more helpful to separate individual classes and to get output result? If so, how can I do this?
0
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1answer
140 views

How can I mosaic raster data which have different number of bands ( 3 and 4)?

I would like to mosaic 100 raster data. several raster data's band are 3, though last data have 4 bands. How can I mosaic raster data which have different number of bands?? If somebody knows how to ...
1
vote
1answer
570 views

How to create a 4 band image from an RGB and a grey scale image?

I have an RGB image and a Gray scale image. I would like to merge them in a 4 bands image. How can I do that? Is there a simple way to do it from QGIS or I have to modify the image before to load them ...
2
votes
0answers
500 views

Enhanced vegetation index using ENVI 4.7 bandmath

I computed Enhanced Vegetation Index using band math in ENVI 4.7 software. The expression used was: 2.5*((float(b1)- float(b2))/(float(b1)+ (6*float(b2)) +(7.5* float(b3)))) BYTSCL(float(b1), min = ...
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2answers
2k views

Multi-Band (RGBA) into single band raster

I have the raster which contains 4 bands (RGBA), which ilustrates the pupulation (traffic) density. I want to convert it to the simple gridded ascii, however I'm getting in the trouble when I try the ...
0
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0answers
97 views

Four band raster - ColorInterp of the IR band

I have a four band aerial photography raster. The bands contain Red, Green, Blue, and IR data. Using GDALInfo we get something like this currently: Band 1 Block=2933x1 Type=UInt16, ...
8
votes
1answer
884 views

How to add a band to an existing GeoTiff using GDAL?

This seems like it should be straightforward but I can't for the life of me figure it out. Given an existing GeoTiff containing a single band, how can you add another band to that GeoTiff? Is the ...
4
votes
2answers
187 views

What Information Does the Blue Band Provide?

I am playing around with ERDAS and was implementing image difference on two rasters separated by interval of time. I was using a blue band raster and I created a default threshold for percentage ...
5
votes
2answers
2k views

Moisture Interpretation from Landsat Images

I am working on a "land suitability for crop" project. Can anyone let me know how to get any type of information which can be related to moisture index of soil? I have Landsat 5 data with band 3 and ...