Importing MrSID satellite imagery

    Hi,


    I'm trying to use MrSID format satellite images as maps in TTQV 2.5. I get my MrSID files from http://zulu.ssc.nasa.gov/mrsid/ no problems, they import and display no problem in TTQV 2.5.


    However how do I read the calibration/world files correctly? When I try to calibrate the map under the 'UTM' tab in the calibration window it keeps telling me that my points (p1, p2 etc.) are not on the map and the meter values displayed in the text boxes are shown in red, they appear to be out of range.


    Am I doing something wrong here or is there a problem importing these worldfiles (.sdw)


    Any assistance or pointers would be appreciated...


    regards


    Hoob


    8-O

    Hello Hoob,


    follow those instructions below exactly. It takes much more time to
    write the explanation then actually doing it :-)


    here is the TTQV way to import plus info about
    UTM zone central meridians:


    - download the sat image
    - unzip
    - open the *.sid image to TTQV (TTQV should be a recent version)
    - you see a calibration dialog, !!select tab!! "projection"
    - select Projection "UTM"
    - enter the "value for "central meridian" (see below)
    - click "read Worldfile" (here *.sdw file, TTQV proposes the right name), confirm
    - save


    You are done!


    Central meridian:
    Each UTM Zone has a different central meridian. You can read the
    UTM-zone of the imported file from the file-name, for example:
    "N-02-60_loc.sid"
    UTM-Zone is "02"
    Find below a list of the central meridians and the zone associations:


    01-->177°West
    02-->171°West
    03-->165°West
    04-->159°West
    05-->153°West
    06-->147°West
    07-->141°West
    08-->135°West
    09-->129°West
    10-->123°West
    11-->117°West
    12-->111°West
    13-->105°West
    14-->99°West
    15-->93°West
    16-->87°West
    17-->81°West
    18-->75°West
    19-->69°West
    20-->63°West
    21-->57°West
    22-->51°West
    23-->45°West
    24-->39°West
    25-->33°West
    26-->27°West
    27-->21°West
    28-->15°West
    29-->9°West
    30-->3°West
    31-->3°East
    32-->9°East
    33-->15°East
    34-->21°East
    35-->27°East
    36-->33°East
    37-->39°East
    38-->45°East
    39-->51°East
    40-->57°East
    41-->63°East
    42-->69°East
    43-->75°East
    44-->81°East
    45-->87°East
    46-->93°East
    47-->99°East
    48-->105°East
    49-->111°East
    50-->117°East
    51-->123°East
    52-->129°East
    53-->135°East
    54-->141°East
    55-->147°East
    56-->153°East
    57-->159°East
    58-->165°East
    59-->171°East
    60-->177°East

    Jockel,


    Thanks very much for the ultra quick response. That worked perfectly!


    Thanks a million.


    regards


    Hoob.
    :grin:

    I have a problem with the central meridian.


    Wanted to import NASA's picture "N-34-25_2000.sid". So far so good. Only when I set the central meridian (which is 34-->21 East as per above list) the calibration is naturally going wrong.


    I recognized that in my TTQV 3.0.120 the box "Lon_0" is always occupiied by a "W".


    Question: Am I too stupid to change this "W" into "E"?


    Question: How to change "W" into "E"?


    Question: What shall I do?



    Many thanks in advance for any help!


    Kuno

    So, I have tried the map "N-33-30_2000.sid". There everything has worked out fine.


    I recognized that when importing the file "*.sdw", I get EAST coordinates for the map "N-33-30" but WEST coordinates for the map "N-34-25".


    But: "N-34-25" is located EAST of "N-33-30".


    What now? Is the given "*.sdw" -file somehow wrong?

    Zitat von "Kuno"

    Question: How to change "W" into "E"?

    Hi Kuno,


    just type in 'e' :lol: you don't need to select the 'W' in advance.
    BTW - in German East is written "Ost". If your program language is German, you have to type 'o'


    Regards - Anton

    Hi,


    I also had the problem with the "o", and I'm a native german but I'm living now abroad. To the programmers: it would be nice to use the key "e" to change to eastern projection.


    Many thanks


    Wolfgang

    Hi,


    If I remember right:
    if TTQV is switched to german language, "O" is the right one to use,
    if it is set to english language, "E" is the right one to use.
    It does not work that way ?

    Gruß Jockel (QV-Admin)
    Angefragte Daten für Supportfälle bitte schicken an info/at/quovadis-gps.com unter Bezugnahme (link) auf diesen thread, Danke!

    Hello Jockel,


    I am also having problems with the calibration of *.sid files imported from https://zulu.ssc.nasa.gov/mrsid/.


    I still can't understand why the *.sdw "wordfile" doesn't work in TTQV 4.


    If TTQV recognises it as a calibration setting why does it give for N-32-35_2000.sid such readings as:


    P1 - E 160 22' 30" / N 44 0' 0"
    P2 - E 500 0' 0" / N 44 0' 0"
    P3 - E 839 37' 30" / N 44 0' 0"


    I also tried to follow the instructions in the posts above but it didn't work for me. If I enter the UTM zone 32 and I know that for that map the central meridian zone association is 32-->9°East, how do I get the other values from for P1- P4 ?


    Best regds,
    Roman (UK)

    Hi Roamn,


    I rechecked the instructions from my second post here in this thread. If you
    follow these instructions !!exactly!!, then it is simple to get these files into
    TTQV4.....provided you use a recent version of TTQV...


    Zitat

    I still can't understand why the *.sdw "wordfile" doesn't work in TTQV 4


    This file works very well according to it´s abilities!
    Generally: a *.sdw (*.tfw) file alone can not provide the required information
    for calibration, as it lacks most of the required information like map-Datum and projection.

    Zitat

    I also tried to follow the instructions in the posts above but it didn't work for me. If I enter the UTM zone 32 ...


    No you did not! The instructions say to use the "projection tab" in calibration
    window, not the "UTM Tab"!

    Gruß Jockel (QV-Admin)
    Angefragte Daten für Supportfälle bitte schicken an info/at/quovadis-gps.com unter Bezugnahme (link) auf diesen thread, Danke!

    Hello Jockel,


    Thanks for your reply.


    I suppose for TTQV version 4.0.79 (Power User) your instructions need clarification and amendment.


    - select Projection "UTM"


    The dialg box is called "1. Select Type of Projection"
    and in it "UTM" is listed by its full name (not an abreviated name).


    - enter the "value for "central meridian" (see below)


    There's no obvious dialog box to enter this value. It should be entered in the dialog box "3. Enter Parameters of Projection".


    Now it works!


    Best regards
    Roman
    (UK)

    Hello Roman,
    do you know this Link?
    http://www.alpenverein-schleiden.de/karten.htm


    There you can get the Calibration-Files for the most of the NASA Images, equal if you downloaded the Landsat7 or the Landsat4/5 Images.
    Simply download the landsat7_sid_cal.zip or the nasa_cal.zip and unpack it in the right Folder.
    Than import the Sat-Images over the CD-Icon.
    There is no need to calibrate them!


    With best regards Denis