How to create raster satellite images.pdf
(
282 KB
)
Pobierz
How to create raster satellite images for use in igo primo
http://www.hairydog.co.uk/create-igo-raster.html
Satellite Images
in iGO Primo GPS
Apps
iGO Primo has the ability to
display images of the
terrain underneath the
roadmaps it displays.
In theory you can buy
these images, but it seems
to be incredibly hard to do
that. So it's a good thing
you can make your own!
This page gives just the
basic details of how to do
it.
Making raster images for iGo Primo
There are a few steps in the process, and although it is not difficult, it is not all
that intuitive!
Firstly you need to source the images to show. There are several providers of
satellite images, but the only ones I have used are Google and Bing.
Once you have collected the images, you have to create individual .jpg images
that each cover 0.125 degrees of longitude and 0.125 degrees of latitude.
These images then have to be converted to a specific file format with the file
extension of .rst.
Then the .rst files have to be assembled together into a .raster file that you
load onto the device running iGO.
Collecting the software
For the first two steps the best tool seems to be a program called SAS Planet. It
is pretty easy to find with a Google search, though the first version I found was
all in Russian (a language I can't read) until I found a "debug" version that
worked in English. As far as I can tell, the current "Nightly" version is the best:
https://bitbucket.org/sas_team/sas.planet.bin/downloads
/SAS.Planet.Nightly.130901.7464.7z
There may well be other programs that
can do this job.
For the second two steps, the only tool I know of is NNG Raster 3.1.5. This was
tricky to find and seems not to have been updated since 2011, despite some
obvious scope for improvement in usability. At least it exists and it does work!
Downloading satellite images with SAS Planet
1z5
2015-04-23 07:08
How to create raster satellite images for use in igo primo
http://www.hairydog.co.uk/create-igo-raster.html
In SAS Planet, press Alt+R to make a
rectangular selection, click at the top left
(NW) corner of the map area you want to
select, then click at the bottom right (SE)
corner. A dialog box will open. Cancel this
to close the dialog box.
SAS Planet will only make its window as
large as the size of your primary display, so
if you have a large monitor and a small one,
make the large one primary before starting.
Look at the map. The area you selected should have a black line round it. If it is
wrong, start again.
If it is about right, go to the Operations menu, Selections Manager, By
Coordinates. Here you need to fine-tune the selection you did by dragging a
rectangle.
The area you have selected needs to start and finish on increments of exactly
0.125 degrees. For example, if you dragged and got the top left to be Latitude
53.999506° Longitude -1.673985° you will need to change it to Lat 54° Long
-1.750°.
Once you have the corners set to 0.125 increments and the rectangle is a
reasonable size (I'd suggest no more than 2 degrees high or wide to start
with), click Apply.
In the dialog box that opens, the Download tab is selected.
2z5
2015-04-23 07:08
How to create raster satellite images for use in igo primo
http://www.hairydog.co.uk/create-igo-raster.html
Choose the source of the download.
Basically you can choose between
'Satellite (Google Maps)' and 'Bing maps -
satellite'. Don't forget to do this for each
download.
In the Zoom box, choose 18. This seems
to be the best setting (the screen grabs
show 16 which is not as clear, but more
Google-safe). Click Start and the sections
of map are downloaded.
When the download completes, click
Cancel to close the dialog box.
You are sailing close to the wind with this.
Google and Bing provide satellite images for
browsing, not for processing. If you
download a lot of images, expect to be
blocked for up to 24 hours.
In Settings / Options / Satellite (Google
Maps), click the Settings button. Set the
Pause to 1000 or slightly higher. This makes
the program wait 1000ms between tiles,
which seems to help avoid the block.
Building image tiles with SAS Planet
Still in SAS Planet, press Ctrl-B to reopen the Selection Manager with the same
area selected. Select the Stitch tab.
Choose Output format: JPEG (Joint Photographic Experts Group) and use the ...
button to choose where to save the files and to give them a name. For this
example, I shall use 'mytown'.
In the Base Map: field, choose the same source (Google or Bing) that you
downloaded, and the same Zoom (18 or 16). Note that these are not the
defaults: you will need to change them over and over again.
In the Split image boxes, select how many tiles of 0.125 high and wide your
selection was. For example, if you selected N54.0 E-1.750 as the top left and
N53.625 and E-1.250 in the bottom right, your area is 3 high and 4 wide.
Click the Start button and your tiles are created.
3z5
2015-04-23 07:08
How to create raster satellite images for use in igo primo
http://www.hairydog.co.uk/create-igo-raster.html
Converting images to
Raster files in NNG Raster
In
NNG Raster will only accept decimal places in
the form of a comma, so UK users will need
to go to their Windows 'Region and
Language' 'Additional Settings' 'Numbers' to
set the Decimal Symbol to ,
NNG Raster, type the name of the region your raster will cover in the City field.
Then click OK. The Country and Source fields change to ???. Replace them with
the correct information for your selection.
Change the Resize Filter to Bicubic and the drop-down that says NNG to HQ.
I'm not sure what difference the Compression Quality makes. Perhaps someone
would like to investigate and report back?
Now click the ... button and select the first of your image tiles. They should be
called something like 'mytown_1-1.jpg'.
Once the file is selected, click the Calculate: button, then click the Compile
Raster Block button.
Wait until it says that the Raster block is saved, then click ... again to select the
next file, Calculate, then Compile Raster Block.
When all of the files you created have been processed, put the figures you used
in SAS Planet into the Coordinates Raster Map fields on NNG Raster and press
the 'Calculate and fill the coordinates' button.
In the left of the window, the E and N coordinates are set for the individual
.RST files.
Note that up till now we have used top left and bottom right, but these
coordinates are the bottom left corner of each tile!
When SAS Planet makes the tiles, it names them across then down. This means
that the tiles physically sit together like this:
[mytown_1-1.jpg] [mytown_2-1.jpg] [mytown_3-1.jpg] [mytown_4-1.jpg]
[mytown_1-2.jpg] [mytown_2-2.jpg] [mytown_3-2.jpg] [mytown_4-2.jpg]
[mytown_1-3.jpg] [mytown_2-3.jpg] [mytown_3-3.jpg] [mytown_4-3.jpg]
and the .rst files have the same names.
However, because NNG Raster likes to make things difficult, the tiles need to be
be listed in this order:
mytown_1-3.rst
mytown_1-2.rst
mytown_1-1.rst
mytown_2-3.rst
mytown_2-2.rst
mytown_2-1.rst
mytown_3-3.rst
mytown_3-2.rst
mytown_3-1.rst
mytown_4-3.rst
mytown_4-2.rst
mytown_4-1.rst
NNG Raster is an effective bit of software,
but it is not intuitive to use. In particular,
follow the order of the instructions on this
page, and give each task time to finish
before starting the next.
There are so many improvements that could
be made to NNG Raster, but I guess whoever
wrote it is happy with it as it is!
4z5
2015-04-23 07:08
How to create raster satellite images for use in igo primo
http://www.hairydog.co.uk/create-igo-raster.html
Fill all the spare slots with tmp.jpg (I have no idea why!)
Once you have all got this sorted, click the Compile Raster NNG button and it
makes the .raster file in about one second. The file will be called UK-Google-
mytown-130824.raster – assuming you said the City was mytown, the Country
was UK, the Source Google and you created it on 24th August 2013.
Load the .raster file into iGO
Copy the raster file you just created to a directory called 'raster' in iGO's
'content' directory, enable 'Satellite Image in 3D' in iGo's Map Settings, and you
should be good to go.
If iGO claims that there are no satellite images installed, this will be because
you are lacking a licence file called
iPhone_Primo_ISR_1101__NNG__DEM__3D__PST__CAR__JV_
_Google__TMC___v2.1__.lyc - you will need to source this and put it into your
licence folder.
It may not work
This extra load may well make iGO run out of memory and crash. If it keeps
crashing, remove all files from the content/raster directory.
5z5
2015-04-23 07:08
Plik z chomika:
jajacekpl
Inne pliki z tego folderu:
How to create raster satellite images.pdf
(282 KB)
LICENSE raster.rar
(1 KB)
Inne foldery tego chomika:
OziExplorer i mapy
Zgłoś jeśli
naruszono regulamin