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Using MPT as Image and/or Elevation

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Andrea Deiana View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrea Deiana Quote  Post ReplyReply Direct Link To This Post Topic: Using MPT as Image and/or Elevation
    Posted: October 07 2003 at 7:08am

I have a 15 GB MPT but I want to cut it and put the minor MPT that would come out into a CD-ROM for a demo, but I am having some problems.

When I add my original MPT as Image and/or as Elevation I have one choice: Include Source into MPU or not. In the first case, when Convert Source(s) starts, I have a Runtime Error (!) and an abnormal program termination (with an application error message ...); in the second case I have a few second MPT Creation with a little MPT file that TEPro cannot open.

I have tried to move my original MPT to another folder, thinking that it might be a problem of writing rights or protection and so on, and when I try to Convert Source using Include Source for single Image or Vector, I had another kind of message: "No Space on Out device For Creating path\file.mpu". Actually, this sounds me strange because of >22GB of free space on Temp Directory and >23GB of free space in another drive where I have original MPT ...

Any suggestion ?

 

Andrea Deiana

General Manager



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Eylon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eylon Quote  Post ReplyReply Direct Link To This Post Posted: November 02 2003 at 10:57am

In general it is not a good idea to subset an MPT from an existing MPT for 2 main reasons:

1. Compression - Your sources are compressed into the MPT. When you use this MPT as a source for another MPT, the file is uncompressed in the background, then compressed again, sometimes on a different MPT ruler. This can sometimes reduce the quality of the data.

2. - resolution and size - If you have an MPT with a big area in 25 meters resolution and a small area with 1 meter. When you add this MPT as a source to TB, it will regard ALL the area of the MPT as being of 1 meter resolution, and will up sample the 25 meters to 1 meter in the resulting MPT !!! You can see this is not optimal. You can bring the MPT twice (or once for each resolution level in the MPT), and use each at a different UPP level, but this is not advised.

Because of the 2nd reason, you can understand what is happening when you try to create an "Include source" MPU for an MPT. It takes all the information in the MPT, and tries to write it as an uncompressed mpu file of the best resolution in the MPT. This can easily cause a "no Space.." messages. Instead you should not include the source. This creates a little "hat" for the MPT (In.mpu), so it can be used as a source for TB.

If possible, use the original sources and project to create a smaller area. If this is not possible, try bringing the MPT in once for each resolution, and using polygons and the UPP in MPT slider to adjust the project to optimum. Feel free to consult Skyline support if you want to go with this option.

Also, Version 4.6 of TEP will introduce a new MPT subsetting tool. This will allow you to load an MPT to the pro, define an area, and create a correct and efficient subset of the MPT. All this without the need to restore your sources.

Eylon
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Andrea Deiana View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrea Deiana Quote  Post ReplyReply Direct Link To This Post Posted: November 03 2003 at 8:43am

I like these technical explications because they are very useful to better understand inner behaviour of TB.

I have already used original sources with new clips to create a minor MTP, but, if I should deal again with MPT subsetting, I would like to try to use MPT twice, using different UPP.

Do you think new MPT subsetting tool of TEP 4.6 will work with globe MPTs ? If yes, in which way ?

Thanks Eylon.

Andrea Deiana

General Manager



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ForumMng View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ForumMng Quote  Post ReplyReply Direct Link To This Post Posted: November 04 2003 at 9:14am

Hi andrea,

The new MPT Subsetting toll of v4.6 will include the entire MPT area in a low resolution. In case of Globe projects the entire globe in low resolution is always included (it doesn't take too much space).

Arik

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Andrea Deiana View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrea Deiana Quote  Post ReplyReply Direct Link To This Post Posted: November 05 2003 at 8:43am

Hi Arik,

some more questions ...

- MPT subsetting will keep my own entire globe MPT in low resolution or will use the BaseGlobe.Ii.mpu ?

- Might I use one square clip (just a square 4 points clip or a many points poligon ?) or more than one ?  With import tool for this or not ?

- Will it be a UPP customization or will it be automatically setted ?

Andrea Deiana

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arik View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote arik Quote  Post ReplyReply Direct Link To This Post Posted: November 12 2003 at 5:38am

Andrea,

 

In the new MPT Subsetting feature you will be able to choose the resolution of the base globe. If the BaseGlobe.Ii.mpu is too big for your need you will be able to reduce its resolution.

At the first stage you will be able to draw a single polygon (more than 4 points) for the high resolution area and another polygon for a medium resolution. For each polygon (including the entire area as a low resolution polygon) you will be able to choose the UPP from the MPT ruler.

This feature will be orginized in a special tool

Arik

 



Edited by arik
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Andrea Deiana View Drop Down
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Joined: July 11 2003
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrea Deiana Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2003 at 6:37am
Thanks Arik.
Andrea Deiana

General Manager



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