[mapserver-users] mapserver-users Digest, Vol 108, Issue 12

[Schepers, Benjamin]

Hi Lowell,

thank you for your response.

< For the oblique images, we use the ground footprint layer to populate a DB table with the four corners of each image and a calculated center for each shot. That table is used as a match against the center of the current map extent to locate the oblique that is the "closet" as a view starting point.
OK so far... could be done in a lot of ways.

<We then use Imagemagick for three different operations to merge the oblique and the map image. Rotate the current map image to match the orientation of the oblique image. Distort (-disort Perspective) to stretch the map image to match the perspective of the oblique. Composite to merge the map <image and oblique into a single image.
The principle I do understand, but how is that implemented in a web application? I know ImageMagick as a commandline-utility; via CGI or PHP-plugin?

<The navigation is not fancy, there are pan arrows provided to allow the user to move to the next oblique to the N,S,E,W of the current oblique and a compass rose to allow the user to change the oblique perspective N,S,E,W. With the pan arrows and compass rotated to match whatever perspective is being <viewed.
Nearly same question as above, how is that done in a web application? Native mapswerver/mapscript-application? My optimum approach would have been to achieve a generic WMS with five layers (Ortho, N, E, S, W), where of them gets exclusively used in an application, say OL3/Leaflet/Mapbender...


Ben


> Date: Mon, 9 Jan 2017 06:37:44 +0000
> From: "Schepers, Benjamin" <schepers at rvr-online.de>
> To: "'mapserver-users at lists.osgeo.org'"
> 	<mapserver-users at lists.osgeo.org>
> Subject: [mapserver-users] Oblique aerial images with mapserver?
> Message-ID:
> 	<7088A26751CB34409B159B4237D510A87C878D7C at W2K8-EXDB02.VERBAND.LOCAL>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hi list,
> 
> are there any suggestions or concepts out there to serve oblique 
> aerial images with mapserver / opensource-software?
> The oblique images are not mosaicked and are just indirectly 
> georeferenced. There do exist ground-footprints as shape with path to 
> each file - comparable to a tileindex.
> 
> One way I thought of, could be mosaicking each direction (N-E-S-W) and 
> add them as separate layers to the service... (I know the results look 
> a bit strange and I also don't know such software for mosaicking - 
> Google's/Bing's secret? Are there any open solutions for that?) 
> Another idea could be to use a "special tileindex mode" for each 
> direction, where just the most matching oblique will be rendered from 
> footprint-tileindex.
> Would you suggest a real 3D-solution? How to serve that?
> 
> Any more hints are welcome :)
> ... and a happy new year!
> 
> Regards
> Ben

Ben,
For the oblique images, we use the ground footprint layer to populate a DB table with the four corners of each image and a calculated center for each shot. That table is used as a match against the center of the current map extent to locate the oblique that is the "closet" as a view starting point.
We then use Imagemagick for three different operations to merge the oblique and the map image. Rotate the current map image to match the orientation of the oblique image. Distort (-disort Perspective) to stretch the map image to match the perspective of the oblique. Composite to merge the map image and oblique into a single image.
The navigation is not fancy, there are pan arrows provided to allow the user to move to the next oblique to the N,S,E,W of the current oblique and a compass rose to allow the user to change the oblique perspective N,S,E,W. With the pan arrows and compass rotated to match whatever perspective is being viewed.
We have yet to investigate the methods used in Birds-eye to see how that works. We expect that the plugin provided by the oblique vendor is being used.
Hope that helps.

Lowell