|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | Re: GISList: SUM: Registering non earth vector file |
| Date: |
08/12/2002 04:07:47 PM |
| From: |
David Nealey |
|
|
I am not a geodesist or cartographer but, Why would you want to do this?
WGS84 takes into consideration the size and shape of the earth. Sure
software can do just about anything but if you apply the terrestrial
parameters to another planetary body what would it mean?
It would be better in my opinion to use parameters established by some
agency such as the USGS or NASA for the planetary body of interest. Those
parameters would include the shape, size, angular velocity, and mass of the
body. Does Autodesk Map or any other commercial program contain these
parameters for the planetary body you are interested in?
Am I missing something? When you say 'non earth', you do do mean non earth
right?
David
----- Original Message -----
From: "Rock Fish" <rockfort@hotmail.com>
To: <gislist@geocomm.com>
Sent: Monday, August 12, 2002 7:12 AM
Subject: GISList: SUM: Registering non earth vector file
> Thank to all who reponded to my qurey. Would like to Thank again:
>
> Tadi Seetharamayya
> P.V.Shyam Sunder
> Christian Singer
> Hussam Kamal.
>
> -------------
> Shyam Sunder gave a very good way of doing it in Autodesk MAP.
>
> Hi Rock,
>
> Follow the procedure as below.
>
> 1 Identify 12 control points for a area of 70 sq. km, on the non
earth
> vector data for which you know lat long values.
>
>
> 2 These 12 points should be distributed all over the data.
>
> 3 Create a new layer with name "source_points". Place 12 points at
the
> identified places in the step 1 above.
>
> 4 Create another layer with name "Target_points". Place 12 points
with
> co-ordinate "X" as latitude value Co-ordinate "Y" as longitude value in
> decimal degrees.
>
> 5 Use Rubbersheet command in the Autocad Map menu. The tool will ask
> you to select objects to be rubber sheeted, source and target points.
>
> 6 Select all the objects in the dwg file and give respective source
> and target points. After the process, the vector data can be called as
> projected in Lat longs(Geographic).
>
>
> In the above creating Source and Target layer is to avoid confusion
between
> source points and target points. The tool does not ask for layer creation.
>
> Please follow the above procedure to convert the non earth dwg file to
> Geographic then I will explain how to use a projection system.
>
> With best wishes,
> -------------
>
> Tadi Seetharamayya also gave a simmilar solution:
>
> Hi Rock fish,
>
> Yes, this can be done in AutoCAD Map and also in
> Arcinfo the principle procedure of working will be the
> same..
>
> It goes like this in Arcinfo:
>
> 1. You identify a minimum of 4 control points whole
> geodetic values you know on the vector layer, so that
> these points covers the whole of your vector layer
>
> 2 create a empty geodetic coverage of these tics and
> Project this empty from local non earth to Lat/long
> wgs84
>
> 3. Now Transform your vector layer from non earth
> vector file to the required geodetic projection.
> (sorry it may be little confusing)
>
> I know these is a better method in AutoCAD Map where
> you can warp your local non earth vector file to the
> projection require.
>
> Just wait and watch for the AUTOCAD Map wiz's to
> reply..
>
> Good luck.
> -------------
>
> Christian Singer said:
>
> Hello Mr Fish,
>
> you don't explicitely mention what software products you are using.
> If, by chance, you have 'MapInfo Prof.' then my 'FlexibleMap' tool may be
a
> suitable solution. More info available at
> www.icsinger.de/flxmap_e.htm
>
> Regards,
>
> -------------
>
> Hussam Kamal said:
>
> Hello,
> You can do this using Autodesk Map , AutoCAD Map 4
>
>
> -------------
>
> My original question was:
>
> Hi,
>
> I have some non earth dwg files which I would like to registe in
geodetic
> WGS84. Can someone tell me how do I go about, any specific software or
> anything for this.
>
> Will sum.
>
> thanks in advance
>
> Rock Fish
>
> ---------------
>
> _________________________________________________________________
> MSN Photos is the easiest way to share and print your photos:
> http://photos.msn.com/support/worldwide.aspx
>
>
>
> To unsubscribe, write to gislist-unsubscribe@geocomm.com
> ________________________________________________________________________
> Setup a GeoCommunity Account and have access to FAST DataDownloads
> and Premium Career Posting at a discounted rate!
> https://www.geocomm.com/cgi-bin/accounts/login
>
> On-line Archives available at
> http://spatialnews.geocomm.com/community
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
