| Re: Plotting data over USGS DOQ images. [message #25328] |
Thu, 07 June 2001 08:17  |
Jairo Santana
Messages: 6
Registered: April 2001
|
Junior Member |
|
|
Ben,
Thanks. I was able to overplot the data using both TVIMAGE and
PLOTIMAGE.
Jairo.
Ben Tupper wrote:
> Hi,
>
> I'm not sure I understand your question. I think you might want to look for the
> MAP_***** commands in the online help for IDL.
>
> Once the plane's path coords and the image coords are in the same coordinate
> system, it seems like the built in IDL mapping tools should allow you to set up
> the coordinate transform, warp the image to the coordinate system and then
> display the image. Once the image is displayed you can use the PLOTS command to
> overlay the flight path.
>
> You might look at Liam Gumley's Underground Guide to IDL (look for Liam's
> website via David Fanning's annotated links page www.dfanning.com). His guide,
> I recall, had a short section on mapping in IDL. While you are there, get a
> hold of ImDisp (Liam's), TVImage (David's) or PlotImage (Craig Markwardt) which
> are all more versatile at displaying images than IDLs built in TV procedure.
>
> I hope I am steering you in the right direction.
>
> Ben
>
> Jairo Santana wrote:
>
>> Ben,
>>
>> Thanks a lot for your help. Yes, I will need to convert the (lat,lon) to LL.
>> The image header has the UTM zone and some other info about the
>> image. So, that won't be difficult. All I need to do now is set the
>> coordinate system and overplot the plane path over the image. If the image
>> is in LL (UTM), how do you establish a coordinate system to be able
>> to plot the plane path LL (converted from lat,lon) over the image?
>>
>> Jairo.
>>
>> Ben Tupper wrote:
>>
>>> Jairo Santana wrote:
>>>
>>>> I need to plot the path of a plane given by (lat,lon) over a USGS
>>>> DOQ image. The image is in UTM projection and BIP format.
>>>> Any code, advice, or suggestion will be very much appreciated.
>>>>
>>>> Thanks,
>>>> Jairo.
>>>
>>> Hi,
>>>
>>> I have attached a ZIPPED bundle of procedures for converting from LL
>>> to UTM (meters of false easting/northing). If you know the UTM zone
>>> for your DOQ image, you should be able to overlay the plane's path on
>>> the image. Alternatively, you could convert your UTM image coords
>>> to LL. Then you could use IDL's built in mapping procedures for
>>> display. I'm not sure if the Map Datum will be important, but it's
>>> worth paying attention to. I'm not familiar with a BIP format.
>>>
>>> Ben
>>> --
>>> Ben Tupper
>>> 248 Lower Round Pond Road
>>> POB 106
>>> Bristol, ME 04539
>>>
>>> Tel: (207) 563-1048
>>> Email: PemaquidRiver@tidewater.net
>>>
>>> ------------------------------------------------------------ ------------
>>> Name: geo.zip
>>> geo.zip Type: Download File (application/x-zip)
>>> Encoding: base64
>
> --
> Ben Tupper
> 248 Lower Round Pond Road
> POB 106
> Bristol, ME 04539
>
> Tel: (207) 563-1048
> Email: PemaquidRiver@tidewater.net
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
