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Ticket
#42
Description

Contacted by Chris Hecker (also previously asked about azgcorr versions in #38). Full email below, but the key points are:

  1. I want to use the ARSF/NERC LIDAR data that was recorded simultaneously with the hyperspectral data to improved geocorrection results. The data I want to correct are Eagle/Hawk data strips. The LIDAR data comes as point clouds in files like "Str_287.all". Can these point clouds be read directly into azgcorr (as what is referred to as an "external file") or do I need to use another software (e.g. SCOP++) to make regular gridded altitude data first?
  2. For the LIDAR data, I presume that I wont need any geoid - ellipsoid correction parameter, since aircraft navigation data as well as airborne LIDAR are both based on DGPS heights above WGS84 ellipsoid. Is that correct?
  3. I saw that there are a lot of special CASI options mentioned in the manual. Are there any for the SPECIM sensor in this version already and where would I find a list of these options?
  4. Now here comes the tricky one:
    In the help file there is the option -E which allows the preprocessing of the LIDAR data cloud to new coordinates. Since all our basemaps are in European datum 1950, I wanted to pre-process the LIDAR cloud to this datum as well.
    Currently the data is in the standard format (UTM zone 30, WGS84) with xcoodrinate including the UTMzone as a prefix.
    The output datum is again UTM zone 30 with International ellipsoid and the following datum parameters dx=-87 dy=-98 dz=-121. no rotational parameters are known to me.
    
    So I tried the following AZGcorr statement:
    azgcorr -ELpt f1 x -d7 0 -87 -98 -121 0 0 0 0 -mUTMZ 30 -e Str_287.all
    
    Which to my knowledge should have given me a properly refernced data cloud for my UTM / ED50 system. I can see from the coordinates that are displayed during the processing that it is not going OK. The conversion of the x coordinate to the longitude value is already going wrong. I also noticed that the central meridian (in this case -0.0396 but changing with each time azgcorr is run ) doesnt make any sense. Am I doing something wrong or is this a bug? I am running azgcorr v. 4.8.3 on a 486pc-linux system.
    

Full email:

Hi Mike;
I started to work myself through the various manuals and LINUX version help file of azgcorr.
I have some questions regarding the processing. Maybe you can help me out with this. I am sure they (i.e. the first three) are pretty straight forward for you.

A) I want to use the ARSF/NERC LIDAR data that was recorded simultaneously with the hyperspectral data to improved geocorrection results. The data I want to correct are Eagle/Hawk data strips. The LIDAR data comes as point clouds in files like "Str_287.all". Can these point clouds be read directly into azgcorr (as what is referred to as an "external file") or do I need to use another software (e.g. SCOP++) to make regular gridded altitude data first?

B) For the LIDAR data, I presume that I wont need any geoid - ellipsoid correction parameter, since aircraft navigation data as well as airborne LIDAR are both based on DGPS heights above WGS84 ellipsoid. Is that correct?

C) I saw that there are a lot of special CASI options mentioned in the manual. Are there any for the SPECIM sensor in this version already and where would I find a list of these options?

D) Now here comes the tricky one:
In the help file there is the option -E which allows the preprocessing of the LIDAR data cloud to new coordinates. Since all our basemaps are in European datum 1950, I wanted to pre-process the LIDAR cloud to this datum as well.
Currently the data is in the standard format (UTM zone 30, WGS84) with xcoodrinate including the UTMzone as a prefix.
The output datum is again UTM zone 30 with International ellipsoid and the following datum parameters dx=-87 dy=-98 dz=-121. no rotational parameters are known to me.

So I tried the following AZGcorr statement:
azgcorr -ELpt f1 x -d7 0 -87 -98 -121 0 0 0 0 -mUTMZ 30 -e Str_287.all

Which to my knowledge should have given me a properly refernced data cloud for my UTM / ED50 system. I can see from the coordinates that are displayed during the processing that it is not going OK. The conversion of the x coordinate to the longitude value is already going wrong. I also noticed that the central meridian (in this case -0.0396 but changing with each time azgcorr is run ) doesnt make any sense. Am I doing something wrong or is this a bug? I am running azgcorr v. 4.8.3 on a 486pc-linux system.
Below I copy a screendump.

Thanks for the help,

Chris

His dump:

hecker@x7:~/in$ azgcorr -ELpt f1 x -d7 0 -87 -98 -121 0 0 0 0 -mUTMZ 30 -e Str_287.all
 
-----------------------------------------------------------------------
azgcorr  -- ver: 4.8.3-lin Jun 12 2007   (C) Azimuth Systems UK 1996, 2007
 

DEM pre processing...
 
Initialised transform for point cloud to WGS84 geogs...
 
Projection and datum shift details initialised....
Spheroid name: WGS84
  semi-major: 6378137.00000  semi-minor: 6356752.31425  e^2: 0.006694380 1/f: 29
8.257223563
Projection name: UTM
  origin  lat: 0.0000  long (central meridian) : -0.0396
  grid coords at origin  easting: 500000.00  northing: 0.00
  scale factor: 0.99960000  hemisphere: north
Datum shift name: none
 
Initialised transform for point cloud WGS84 geogs to local datum and projection.
..
 
Projection and datum shift details initialised....
Spheroid name: INTERN
  semi-major: 6378388.00000  semi-minor: 6356911.94613  e^2: 0.006722670 1/f: 29
7.000000000
Projection name: UTM
  origin  lat: 0.0000  long (central meridian) : -3.0000
  grid coords at origin  easting: 500000.00  northing: 0.00
  scale factor: 0.99960000  hemisphere: north
Datum shift name: SING
  old spheroid name: INTERN
  semi-major: 6378388.00000  semi-minor: 6356911.94613  e^2: 0.006722670 1/f: 29
7.000000000
  dx: -87.0000 dy: -98.0000 dz: -121.0000 metres  sc: 0.000000  ppm
  rx: 0.0000 ry: 0.0000 rz: 0.0000 secs
 

old x: 593792.77 y: 4095708.38  z: 131.270 lat: 37.0028547 lng: 1.0145276
new x: 857185.96 y: 4102748.87 z: -12.407
old x: 593792.77 y: 4095708.39  z: 131.310 lat: 37.0028548 lng: 1.0145276
new x: 857185.96 y: 4102748.88 z: -12.367
old x: 593792.79 y: 4095707.83  z: 131.270 lat: 37.0028497 lng: 1.0145278
new x: 857186.00 y: 4102748.32 z: -12.407
old x: 593792.79 y: 4095707.84  z: 131.290 lat: 37.0028498 lng: 1.0145278
new x: 857186.00 y: 4102748.33 z: -12.387
old x: 593792.82 y: 4095707.10  z: 131.300 lat: 37.0028432 lng: 1.0145280
new x: 857186.05 y: 4102747.59 z: -12.377
old x: 593792.82 y: 4095707.12  z: 131.340 lat: 37.0028433 lng: 1.0145280
new x: 857186.05 y: 4102747.61 z: -12.337
old x: 593792.91 y: 4095706.78  z: 131.310 lat: 37.0028403 lng: 1.0145290
new x: 857186.15 y: 4102747.27 z: -12.367
old x: 593792.90 y: 4095706.80  z: 131.370 lat: 37.0028404 lng: 1.0145289
new x: 857186.14 y: 4102747.29 z: -12.307
 
file: Str_287.all  converted points: 3910381
 
End of DEM run
#43
Description

azgcorr's point cloud conversion function appears to have a problem with correctly detecting the UTM zone from a ULM LIDAR point cloud. Specifically, with a file like:

  472077.149175 30593792.77 4095708.38  131.27    87 30593792.77 4095708.39  131.31    87
  472077.149205 30593792.79 4095707.83  131.27    81 30593792.79 4095707.84  131.29    81
  472077.149235 30593792.82 4095707.10  131.30   100 30593792.82 4095707.12  131.34   100
  472077.150285 30593792.91 4095706.78  131.31   105 30593792.90 4095706.80  131.37   105
  472077.150315 30593792.89 4095707.31  131.26    84 30593792.89 4095707.33  131.30    84
  472077.150345 30593792.86 4095708.07  131.31    84 30593792.86 4095708.07  131.30    84
  472077.150375 30593792.82 4095708.87  131.46    89 30593792.82 4095708.87  131.47    89
                 easting     northing   height        easting     northing   height (last pulse)
               UTM zone 30 appended to easting coords
...

and running azgcorr -ELpt f1 x -d7 0 -87 -98 -121 0 0 0 0 -mUTMZ 30 -e Str_287.first1000, you get:

azgcorr  -- ver: 4.8.3-lin Jun 12 2007   (C) Azimuth Systems UK 1996, 2007


DEM pre processing...

Initialised transform for point cloud to WGS84 geogs...

Projection and datum shift details initialised....
Spheroid name: WGS84
  semi-major: 6378137.00000  semi-minor: 6356752.31425  e^2: 0.006694380 1/f: 298.257223563
Projection name: UTM
  origin  lat: 0.0000  long (central meridian) : -0.0288
  grid coords at origin  easting: 500000.00  northing: 0.00
  scale factor: 0.99960000  hemisphere: north
Datum shift name: none

Initialised transform for point cloud WGS84 geogs to local datum and projection...

Projection and datum shift details initialised....
Spheroid name: INTERN
  semi-major: 6378388.00000  semi-minor: 6356911.94613  e^2: 0.006722670 1/f: 297.000000000
Projection name: UTM
  origin  lat: 0.0000  long (central meridian) : -3.0000
  grid coords at origin  easting: 500000.00  northing: 0.00
  scale factor: 0.99960000  hemisphere: north
Datum shift name: SING
  old spheroid name: INTERN
  semi-major: 6378388.00000  semi-minor: 6356911.94613  e^2: 0.006722670 1/f: 297.000000000
  dx: -87.0000 dy: -98.0000 dz: -121.0000 metres  sc: 0.000000  ppm
  rx: 0.0000 ry: 0.0000 rz: 0.0000 secs


old x: 593792.77 y: 4095708.38  z: 131.270 lat: 37.0028547 lng: 1.0253605
new x: 858150.51 y: 4102789.67 z: -12.422
old x: 593792.77 y: 4095708.39  z: 131.310 lat: 37.0028548 lng: 1.0253605
new x: 858150.51 y: 4102789.68 z: -12.382
old x: 593792.79 y: 4095707.83  z: 131.270 lat: 37.0028497 lng: 1.0253606

The first time the central meridian appears in the output, it is -0.0288 (should be -3). On subsequent runs, this number changes at random.

Specifying the meridian manually (e.g. azgcorr -ELpt f1 W003 -d7 0 -87 -98 -121 0 0 0 0 -mUTMZ 30 -e Str_287.first1000-nozone) appears to work. Rather oddly, it doesn't appear to matter if the UTM zone is stripped from the coordinates or not - the output is identical.

Contacting Bill to see if this is a bug or a misunderstanding on our part.

#45
Description

Create tickets for flight data collection or processing as appropriate (follow Procedures/NewDataArrival for processing tickets, collection ticket templates tbd). Update status pages as needed.

Here's the info Gary sent me:

PROJECT	PI 	SITE	STATUS
GB07/07	Tim Malthus	Inverclyde (spring)	Data collected 102a
GB04/19	Sandra Winterbottom	Nigg Bay	Data collected 102b
GB07/05	Andrew Tyler	Loch Leven (spring)	Data collected 103abc
GB05/02	Alejandro Souza	Dee Estuary	Data collected 109a
GB07/05	Andrew Tyler	Estwaithe W (spring)	Data collected 116a
GB07/05	Andrew Tyler	Windemere (spring)	Data collected 116a
BGS07/02	Stuart Marsh	Keyworth	Data collected 172
GB07/07	Tim Malthus	Inverclyde (early summer)	Data collected 191a
GB07/06	Doreen Boyd	Dorchester	Data collected 192a
GB07/06	Doreen Boyd	New Forest	Data collected 192b
CEH07/06	Andrew Wilson	Worcestershire	Data collected 192c
GB07/05	Andrew Wilson	Wytham Wood	Data collected 73
GB05/07	Paul Bates	Upper Severn	Data collection current
GB05/07	Paul Bates	Lower Severn	Data collection current
GB06/07	Tim Malthus	Silver Flowe (spring)	Missed due to poor weather
GB06/07	Tim Malthus	Munsary Peatlands (spring)	Missed due to poor weather
GB07/05	Andrew Tyler	Loch Leven (early summer)	Missed due to poor weather
GB07/05	Andrew Tyler	Estwaithe W (early summer)	Missed due to poor weather
GB07/05	Andrew Tyler	Windemere (early summer)	Missed due to poor weather
HY05/07	Julia McMorrow	Longdenda	Reflight pending
CEH07/01	Andrew Wilson	Hillesdon	
CEH07/02	Andrew Wilson	Stanlow	
CEH07/03	Andrew Wilson	Sailsbury Plain	
CEH07/04	Andrew Wilson	Morehouse/Ribblehead/Hellifield	
GB01/12	Anthony Cooper	Ripon	
GB01/12	Anthony Cooper	Ripon	
GB03/01	Jim Williams	Fiskerton-Barlings	
GB04/07	David Gilvear	River Tummel	
GB05/03	Mat Disney	Harwood Forest (1)	
GB05/03	Mat Disney	Harwood Forest (2)	
GB05/07	Paul Bates	Upper Thames	
GB05/07	Paul Bates	Stour	
GB05/13	Peter Land	Plymouth Sound	
GB06/02	Tom Spencer	Freiston Shore	
GB06/05	Tim Malthus	Clocaenog F	
GB06/05	Tim Malthus	Glasfynydd F	
GB06/07	Tim Malthus	Silver Flowe (summer)	
GB06/07	Tim Malthus	Munsary Peatlands (summer)	
GB06/07	Tim Malthus	Silver Flowe (autumn)	
GB06/07	Tim Malthus	Munsary Peatlands (autumn)	
GB06/08	Claire Flemming	Weardale	
GB07/03	Gemma Bell	Multi-Wales 1-4	
GB07/04	Peter Halkon	Hayton	
GB07/05	Andrew Tyler	Loch Leven (late summer)	
GB07/05	Andrew Tyler	Estwaithe W (late summer)	
GB07/05	Andrew Tyler	Windemere (late summer)	
GB07/05	Andrew Tyler	Loch Leven (autumn)	
GB07/05	Andrew Tyler	Estwaithe W (autumn)	
GB07/05	Andrew Tyler	Windemere (autumn)	
GB07/05	Andrew Wilson	Wytham Wood (1)	
GB07/05	Andrew Wilson	Wytham Wood (2)	
GB07/05	Wilson	Wytham Wood (3)	
GB07/07	Tim Malthus	Inverclyde (late summer)	
GB07/12	Wilson	Peak District	
HY05/02	Graham Ferrier (Flemming)	East Ayrshire	
HY05/04	Wilson	Pitsea/Thameshaven	
HY05/06	Mark Culter	Glenogil	
			

These two will have to be better identified before they are included
HY05/09			
GB04/27			
			
This job uses the AIMMS-20 atmospheric suite of instuments			
GB07/01	Geraint Vaughhan	Caple Dewy (1)	
GB07/01	Geraint Vaughhan	Caple Dewy (2)	
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