[Gdal-dev] gdalinfo

Norman Vine nhv at cape.com
Thu Oct 14 13:28:30 EDT 2004 

Dobmeyer, Todd writes:

> That is the problem. I do not know if the tif files start at the very top of the globe, 
> or if they are at say 80 or 85 degrees North. If I could figure this out, how would I 
> use gdal_translate and gdal_warp to make a .tfw file? Thanks.

see attached readme for 'official' info about the NASA BlueMarble Files

Hopefully the info below should be sufficient for you to georeference these

HTH

Norman

=============

eastern_hemisphere

Geotiff_Information:
   Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      ModelTiepointTag (2,3):
         0                0                0
         0.0      90.0       0
      ModelPixelScaleTag (1,3):
         0.00833333334   0.00833333334   0
      End_Of_Tags.
   Keyed_Information:
      GTModelTypeGeoKey (Short,1): ModelTypeGeographic
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GeographicTypeGeoKey (Short,1): GCS_WGS_84
      GeogLinearUnitsGeoKey (Short,1): Linear_Meter
      GeogAngularUnitsGeoKey (Short,1): Angular_Degree
      End_Of_Keys.
   End_Of_Geotiff.

western_hemisphere:

Geotiff_Information:
   Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      ModelTiepointTag (2,3):
         0                0                0
         -180.0      90.0       0
      ModelPixelScaleTag (1,3):
         0.00833333334   0.00833333334   0
      End_Of_Tags.
   Keyed_Information:
      GTModelTypeGeoKey (Short,1): ModelTypeGeographic
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GeographicTypeGeoKey (Short,1): GCS_WGS_84
      GeogLinearUnitsGeoKey (Short,1): Linear_Meter
      GeogAngularUnitsGeoKey (Short,1): Angular_Degree
      End_Of_Keys.
   End_Of_Geotiff.

-------------- next part --------------
Dear User,

This site features a series of consistently processed datasets (land, sea
ice and clouds) from TERRA MODIS and related datasets (topography, land
cover, city lights), all at the 1km resolution. They all originate from processing of
this sensor's data through the years 2000-2001 and originate in the final version
from January 2002. You can find the blue
marble and related files at this site for public download:

ftp://gloria2-f.gsfc.nasa.gov/pub/stockli/


It follows a short description of the datasets
----------------------------------------------

All datasets are in the regular lat-lon grid with a grid spacing of
0.008333 degrees per pixel. This projection results in heavy distortion
over the poles, but is suitable for most imaging purposes and needs
least explication to the user. Once mapped onto a globe or reprojected
to a more suitable global map the distortions are no longer visible. The
files are all split into the western and eastern hemisphere with a pixel
dimension 21600x21600 each. This way people using Photoshop can read and
look at the files. Most are in the byte grayscale other in the
interleaved RGB 24bit space, but also some in the signed 16bit integer
data format (I am not sure if photoshop can handle signed integer...?). 

A lot more re-touching could be applied to the blue marble land+ocean
dataset, but considering the time constraints we have for the Olympics
display, I think that this is the best we can provide and I look forward
to hear your comments on the images and on the visualizations that are
going to be made with it. I will render some hi-res globes myself with
the new datasets when I find some time.


Blue Marble terrestrial data
---------------------------- 
Dataset: MOD09A1, MOD12Q1
Format: raw 8bit-per-channel RGB interleaved, 21600x21600
Compositing period: Day 145-241/2001 with 2-3 weeks gaps

flat unshaded:
MOD09A1.E.interpol.cyl.retouched.3x21600x21600.gz
MOD09A1.W.interpol.cyl.retouched.3x21600x21600.gz

topography hill-shaded (3x scaled) - light from 45degNW
MOD09A1.E.interpol.cyl.retouched.topo.3x21600x21600.gz
MOD09A1.W.interpol.cyl.retouched.topo.3x21600x21600.gz

topography + bathymetry hill-shaded (3x on land and 6x seafloor)
MOD09A1.E.interpol.cyl.retouched.topo.bathymetry.3x21600x21600.gz
MOD09A1.W.interpol.cyl.retouched.topo.bathymetry.3x21600x21600.gz

The Blue Marble Antarctica data origins from the NOAA AVHRR sensor and was
compiled at 1km by: Jane G. Ferrigno and Pat S. Chavez Jr., USGS
http://TerraWeb.wr.usgs.gov/TRS/projects/Antarctica/AVHRR.html

Problem areas: west Africa, central China, Indonesia, West coast of
Ecuador


Blue Marble Sea Ice data
------------------------
Dataset: Dataset: MOD29P1D
Format: Byte sea ice mask, 21600x21600
Compositing Period: Spring 100-108/2001 Autumn 240-248/2001

MOD29P1D.E.autumn.21600x21600.gz
MOD29P1D.W.autumn.21600x21600.gz

MOD29P1D.E.spring.21600x21600.gz
MOD29P1D.W.spring.21600x21600.gz

Problem areas: Some cloud mask artifacts. At all, polar sea ice is not
really looking nice on a rectangular cylindrical projection!


Blue Marble Cloud layer
-----------------------
Dataset: MOD021KM, MOD03, MOD35_L2, MOD06_L2
Format: 8bit cloud reflectance, 21600x21600
Compositing period: Day 210/2001 (day 320/2001 stitched at the south)

cloud.E.2001210.21600x21600.06.zip
cloud.W.2001210.21600x21600.06.zip

Problem areas: No data over the poles.


World City Lights
-----------------
Format: 8bit light reflectance mask (intensity scaled exponentially)

world_lights_cities.E.21600x21600.gz
world_lights_cities.W.21600x21600.gz

Attention: The world lights dataset should be directly downloaded at the source:
http://dmsp.ngdc.noaa.gov/html/projects/lights.html


Land Cover map (also land/ocean mask)
-------------------------------------
Format 8bit map (values 0-13, 0 is water >0 is land)
Classification see DeFries. et al. (1998) and 
Hansen et al. (2001)

landcover.E.21600x21600.gz
landcover.W.21600x21600.gz

Attention: The land cover dataset should be directly downloaded at the source: http://www.geog.umd.edu/landcover/1km-map.html


Topography maps
---------------
Format: 2-byte unsigned integer. Topgraphy has been shifted by 32768 so that all values
remain positive. Dimensions: 21600x21600
Units: meters

Land and Ocean:
topo.bathymetry.E.21600x21600.gz
topo.bathymetry.W.21600x21600.gz

Land only:
topo.E.21600x21600.gz
topo.W.21600x21600.gz

Ocean only:
bathymetry.E.21600x21600.gz
bathymetry.W.21600x21600.gz

Attention: The topography dataset should be directly downloaded at the source:
http://edcdaac.usgs.gov/gtopo30/gtopo30.html


When using these datasets please give credits to:
-------------------------------------------------
Author: 
Reto Stöckli, NASA/Goddard Space Flight Center, stockli at cyberlink.ch

Address of correspondance:
Reto Stöckli                    Phone:  +41 (0)1 271 8463
NASA GSFC/ SSAI                 Email:  stockli at cyberlink.ch
Landenbergstr. 16a              Web:    http://visibleearth.nasa.gov
8037 Zürich Switzerland                 http://earthobservatory.nasa.gov

Supervisors: 
Fritz Hasler and David Herring, NASA/Goddard Space Flight Center

Funding:
This project was realized under the SSAI subcontract 2101-01-027 (NAS5-01070)


Original data sources
---------------------
1. Land,ocean,sea ice and clouds: MODIS Atmosphere, Land and Ocean Discipline Groups
   http://modarch.gsfc.nasa.gov/

2. Antarctica: Pat S. Chavez, Jr., USGS, 2255 N. Gemini Dr., Flagstaff, AZ 86001
   http://TerraWeb.wr.usgs.gov/TRS/projects/Antarctica/AVHRR.html

3. Topography (Land and ocean): USGS EROS data center
   http://edcdaac.usgs.gov/gtopo30/gtopo30.html

4. Land Cover: UMD 1km Land Cover, Hansen et al. (2000)
   http://www.geog.umd.edu/landcover/1km-map.html

5. City lights: World Stable Lights Images - October 1994 to March 1995
   Derived from DMSP OLS Nighttime Imagery, produced at NOAA/NGDC.
   http://dmsp.ngdc.noaa.gov/html/projects/lights.html

More information about the Gdal-dev mailing list