[GIS] How to convert QGIS generated tiff images into jpg/jpeg using GDAL command line utilities

gdalgeotiff-tiffqgis

I want to develop a web portal that will show the images dynamically produced by QGIS, but QGIS provided tiff images are too big in size and it is not possible to show it on website using image viewers. That's why I have decided to convert those tiff images into jpg/jpeg to reduce in size as well as browser friendly so that I can show those images on my website easily. But I don't know how to convert tiff images into jpg/jpeg using gdal commands.

Please help me in this regard.

Best Answer

try this with gdal:

gdal_translate -of JPEG -scale -co worldfile=yes input.tiff output.jpg

it also create worldfile too...

i hope it helps you...

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[GIS] create blended images with GDAL command line utilities

You're going to want to use the Python imaging library. PIL.

You will want to load up the first image of the DEM and make sure its in an RGBA format.

from PIL import Image

dem_image = Image.open('dem.png').convert('RGBA')
color_pixels = Image.open('pixels.png').convert('RGBA')

combined = dem_image.paste(color_pixels, (0,0), color_pixels)

Might need to make sure your color_pixels image has an alpha layer as that's what is used for paste. Otherwise you will have to go through it and create a transparency layer in color_pixels by iterating over the values and setting white to an alpha channel.

Hope that helps, or at least gets you started.

[GIS] How to study qgis generated tiff images for water flow/resources

i think you should check out grass plugin for your study. it has lots of raster analysis as Hydrologic modeling toolbox. you can check out GRASS GIS 6.4.3svn Reference Manual here

Watershed modeling related modules are r.basins.fill, r.water.outlet, r.watershed, and r.terraflow. Water flow related modules are r.carve, r.drain, r.fill.dir, r.fillnulls, r.flow, and r.topidx. Flooding can be simulated with r.lake. Hydrologic simulation model are available as r.sim.sediment, r.sim.water, and r.topmodel.

r.flow - Construction of slope curves (flowlines), flowpath lengths, and flowline densities (upslope areas) from a raster digital elevation model (DEM).
r.watershed - Watershed basin analysis program.
r.water.outlet - Watershed basin creation program.
r.drain - Traces a flow through an elevation model on a raster map.

and getting some fundamental information you can glance at The GRASS GIS software (with QGIS) - GIS Seminar, here

i hope it helps you...

Best Answer

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[GIS] create blended images with GDAL command line utilities

[GIS] How to study qgis generated tiff images for water flow/resources

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