Satellite Image Maps of Algeria 1:200.000
 

I have created some satellite maps using the Algeria 1:200.000 IGN Maps as template.
The resolution is 30m! Check out the page http://www.image-contrails.de/sat-map
There they can be downloaded... including a Touratech QV Calibration File...

Currently only 4 are "published" :-(
Djanet, Feuille ??
I n Eker, Feuille NG-31-VI
Ta n Mellelt, Feuille NG-32-XIII
Tadoumet, Feuille NF-32-XV

Cheers
Uli

Uli,
They are amazing - I was checking out the Djanet map - wow!!

Sam

Nice job Uli - just the one's I wanted too... let us know when you've done the whole set.

Chris S

Excellent! Out of interest where did you get the satellite images from??

Tom MC

Chris S: Answer to your question: "let us know when you've done the whole set"

Well, it is a lot of work (each map takes about 3 hours) so I'll probably finish not to many ...


Tom: Answer to your question: "where did you get the satellite images from"

I'm working since 15 years in the field of remote sensing which means I just had to come across data like these ... :-)
They are Landsat 5 Thematic Mapper data with originally 28.5m pixel resolution. The colors are not the natural ones instead infrared bands have been used so lithology (especially in desert regions) is more colorful.

@ uli !

THX for the great job and publishing in this forum !!

Greetings HANNES

now this is perfect.
On the Djanet map there can be seen even the read from the airport to the oasis.

great job.
Could you do the same map for mt. Tahat area ?

regards.
Bart.

I've tried putting the Djanet one into OziExplorer, but it just crashes! Any ideas??!!

Sam.

Sam, I think the reason is not the satellite map as it is pure .jpeg. One thing I believe could be a problem is that the 3MB .jpeg's expand when loaded in to a display program to 62MB in memory. Maybe your memory is low or OziExplorer can not handle files of this size although I do not think this is the reason.

Uli.

I haven't yet checked, but OziExplorer does not accept jpegs with certain colour/size formats. I think this could be the problem, solved, I reckon, by putting into CorelDraw and making the image more basic (seems a shame though!!)

Sam

@ SAM !

It´s time to change to TTQV 2.5 !

I´m sure that this is the far best GPS moving map software , with the most features in the program and the best support of ALL softwares that ever run on my PC.
Work with it since three years - this winter for 8000 km online tracksaving through Algeria without missing not one point and changing very often betweens several maps from different scales.

Greetings HANNES

[This message has been edited by Hannes (edited 05 May 2002).]

Gidday UT, I notice that you've over the years collected data from remote sensing is there an off-chance that some of the data includes any Australian Deserts?


------------------
Macca
Without adventure life is in full decay.

because of high demand :-) i have put some more satellite-maps of Algeria on www.image-contrails.de/sat-map ...

Uli

Uli,
You're a star!
One question please, I'm about to buy the Touratech-QV software (hope to get it sooner than some poster have suggested). Will it be self evident from the software manual how to calibrate you maps with their software?

------------------
Roman (UK)
www.polandrover.com

Hi,
I just tried to calibrate the huge Djanet map on my PC with OZIExplorer V3.90.3a - no problems at all.
As UT said the jpg images will use a very huge amount of RAM, possibly too much for some computers, so I always convert jpg maps to PNG-256 colors, which uses more space on disk but is faster to load and uses only a 1/3 of RAM.

I did not tried to import the QV calibration file into OZI, may be that operation could be responsible for the crashing ozi.

Bye, Yves http://www.redjem.ch

These maps are really GREAT, but how can I calibrate them having no IGN maps. In case where there is some town of wchih I know the coordinates and the scale of map, I handle it but in such case like i.e. Amiguid that cannot be done this way.

Has anyone any idea ?

Bart.

Hi Roman, dont know if you need to know this but you can buy TTqv at Bracken bike shop off Old Kent Rd
020 7232 1814
Ask for John Hill, he knows the whole ttqv story

CS

Calibrating

Joachim, the guy who designed qvtells me he is about to release a huge 5 gig DVD calibrated sat pic including Africa down to the Senegal line at a scale of about 259,000

"Price DVD 59EUR (not finally decided). Please aks me again in about 4 weeks, I will send you one. But you will need recent software to view
the maps.
There is a LIzzardtech Viewer for MAC too:
http://www.lizardtech.com/products/index.php?d=1
you need : "MrSID Viewer"

jbpcs@d63500.de

CS

Let me clarify something: the satellite images (the ones which are not in the IGN Frame) just cover very rougly the corresponding IGN-map area. That's why they all have a different size.
Consequence: the corners can NOT be used for a calibration. This can ONLY be done with the IGN-Maps OR any other maps which show features which can be identified in the image AND in the map.

Cheers
Uli

Really great site, well done and thanks a lot!

Unfortunately I have problems downloading the first three pics (the other 17 are OK and stored savely on my HDD!) Has anyone got any clues or hints?

Okay loads of people downloaded the files! Thats for sure, they are great!!

But did anyone started calibrating the rest of the images? And cant he put them online.

If you dont have webspace, drop me a line, I will put them on my homepage....

Please let me know otherwise we are all doing the same job!


------------------
CU under the Cu

Frank
http://www.crossing-africa.com .:. The Ultimate Travel on a Yamaha XT600Z

Sahara-Info.ch just produced a CD-ROM with 34 satellite images of the Sahara from Mauritania to Egypt. They come calibrated for Ozi and TTQV.
To fit everything on one CD, 34 scenes are in 114m/Pixel resolution and 9 of the most interesting regions (Morokko, east-Algeria, SW Libya) are in full resolution (28.5m/Pixel).
Image compression techniques used are ECW and MrSID, both supportetb by the latest Ozi and TTQV versions.
Price is 30EUR plus shipppment.

The documentation is still in german, but I will add an english section this weekend.

To know more:
http://www.sahara-info.ch/GPS/Satell...der/SatCD1.htm

Bye, Yves

The source of most of the high resolution satellite images currently available to the public is http://zulu.ssc.nasa.gov/mrsid/. From there you can download 28.5m images of almost the whole world. Originally they are from the company Earthsat http://www.earthsat.com. The images are also sold at: http://www.geocover.com

Once downloaded, the zipped images (usually 40MB each) are in a compressed file format which can be read –after unzipping- with a free visualization program from LizardTech: http://www.lizardtech.com called: MrSID GeoViewer. It as well has the option to export the files to TIFF for further processing (and produce the maps I did in www.image-contrails.de/sat-map).
Or you can import it directly in navigation software (TTQV and OziExplorer I guess) which can read MrSID-formats. You can easily calibrate the images as in the MrSID GeoViewer UTM coordinates are displayed…

Have fun…

Via what way on http://zulu.ssc.nasa.gov/mrsid/ do you get the best resolution images, for instance via:

In - 2x - 1600 Pixels and the 100 - 1600x1200

Or an other way? Please let me know thanks!

------------------
CU under the Cu

Frank
http://www.crossing-africa.com .:. The Ultimate Travel on a Yamaha XT600Z

Well, on http://zulu.ssc.nasa.gov/mrsid/ you first click on the tile you are interested in. Then you activate the option "Select EarthSat MrSID Image to View" (on the bottom of the graphics).
Next step, you again click on the image selected and a new window opens with an overview of the selected tile. Now you have the choice to select "Download MrSID Image". his will download the tile selected in a 28.5m/pixel resolution. The size is usually 40MB. To view the tile you first have to unzip (http://www.winzip.com/) the image and then open it with the MrSid GeoViewer as discribed...
With the MrSid GeoViewer you have the choice to extract parts to a TIFF file, which again can be imported by many graphic programs... like PaintShop Pro...

Cheers
Uli

I'd love to put all the GPS files here on HU - just let me know, or put me in contact with whomever, and we'll get them posted here. At least here, they'll always be available for sure! We still have stuff going back to 1998!

OziExplorer notes
 

Hi,
For those using Oziexplorer ..
There is no need to convert the Mrsid images you get off the site - simply use them directly in OziExplorer - it does that fine.

Calibration of the images is a different story! For the Sydney Australia map I used a large dam in the north West corner ... had difficulty with towns id... so picking some large earth feature is important. The sydney harbour bridge was easy to pick off ... here is part of the calibration file

OziExplorer Map Data File Version 2.2
S-56-30_2000.sid
C:\OziExplorer\Maps\Australia\S-56-30_2000.sid
1 ,Map Code,
WGS 84,WGS 84, 0.0000, 0.0000,WGS 84
Reserved 1
Reserved 2
Magnetic Variation,,,E
Map Projection,(UTM) Universal Transverse Mercator,PolyCal,Yes,AutoCalOnly,No,BSBUseWPX,No
Point01,xy, 8090, 4512,in, deg, 30, 33,S, 150, 39.7872,E, grid, , , ,S
Point02,xy,23906, 3896,in, deg, 30,29.50782,S, 153, 0.75588,E, grid, , , ,S
Point03,xy,12200,30136,in, deg, 33,51.12888,S, 151,12.64158,E, grid, , , ,S
Point04,xy, 2042,37818,in, deg, 34,48.24318,S, 149,36.54786,E, grid, , , ,S
Point05,xy, 8433,38090,in, deg, 34, 51.8262,S, 150, 36.0936,E, grid, , , ,S
Point06,xy, , ,in, deg, , ,S, , ,E, grid, , , ,S

The attached text file should be renamed S-56-30_2000.map for use in Oziexplorer.

Humm 2000 might be the year the photo was taken..

Direct imortation of MrSid images
 

Oziexplorer has advanced ...

Method of importing the image without doing a manual calibration ..


Yahoo! Groups

The calibration 'only' uses 2 points ... but it looks like a good calibration.
That certainly saves a lot of work. :funmeteryes:

The maps themselves. Well for OZ they are ok for the main roads .. but tracks are hidden in vegetation (and snow where that occurs in winter - yes they are taken in our winter season).