UTM-K[EPSG:5179] Support

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SeungwooKim
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UTM-K[EPSG:5179] Support

#1 Beitrag von SeungwooKim »

Hello

I'm currently working on ZUSI routes for Korea. Though with great program as TransDEM, I unable to advance the progress of the work.

Here's the problem. All of the data I used were from Korean NGII(National Geographic Information Institute) and they release all the data in UTM-K(EPSG:5179)
As TransDEM doesn't support the UTM-K[EPSG:5179], all the DEM data I've prepared are useless

Here is the description of UTM-K(EPSG:5179) a.k.a Korea 2000 / Unified CS
https://epsg.io/5179

1. Could you add new UTM-K[EPSG:5179] coordination system into TransDEM
2. If not, Is there any other way to manually add the coordination system to TransDEM? (like WKT in QGIS)

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#2 Beitrag von Roland Ziegler »

SeungwooKim hat geschrieben: 10.12.2022 12:36:32 Could you add new UTM-K[EPSG:5179] coordination system into TransDEM
I will have a look into that, shouldn't be too complicated. I may find some time over Christmas. Not sure about the geodetic datum yet.
SeungwooKim hat geschrieben: 10.12.2022 12:36:32 If not, Is there any other way to manually add the coordination system to TransDEM? (like WKT in QGIS)
No, unfortunately. While you can add parameters to the xml file, these won't be propagated to the user interface.

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#3 Beitrag von Roland Ziegler »

Is there any sample data available? I have identified the parameters for UTM-K but I would want to test this before releasing it.

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SeungwooKim
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Re: UTM-K[EPSG:5179] Support

#4 Beitrag von SeungwooKim »

Roland Ziegler hat geschrieben: 27.12.2022 13:45:18 Is there any sample data available? I have identified the parameters for UTM-K but I would want to test this before releasing it.
90m DEM using UTM-K for testing
Zuletzt geändert von SeungwooKim am 09.01.2023 01:18:47, insgesamt 1-mal geändert.

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#5 Beitrag von Roland Ziegler »

Thank you.

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#6 Beitrag von Roland Ziegler »

What is the actual location of the sample data? And are you sure it's in UTM-K, EPSG 5179?

I'm asking because I can't make it fit. The Transverse Mercator parameters for UTM-K are, according to https://epsg.io/5179:
latitude_of_origin: 38
central_meridian: 127.5
scale_factor: 0.9996
false_easting: 1000000
false_northing 2000000

However, the origin in the DEM file, south west corner, is, as read from the ERDAS Imagine header:
247519 easting
455944 northing

This would place the DEM in the open sea near the west coast of Taiwan.

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SeungwooKim
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Re: UTM-K[EPSG:5179] Support

#7 Beitrag von SeungwooKim »

Roland Ziegler hat geschrieben: 03.01.2023 17:42:46 What is the actual location of the sample data? And are you sure it's in UTM-K, EPSG 5179?

I'm asking because I can't make it fit. The Transverse Mercator parameters for UTM-K are, according to https://epsg.io/5179:
latitude_of_origin: 38
central_meridian: 127.5
scale_factor: 0.9996
false_easting: 1000000
false_northing 2000000

However, the origin in the DEM file, south west corner, is, as read from the ERDAS Imagine header:
247519 easting
455944 northing

This would place the DEM in the open sea near the west coast of Taiwan.
-
Really sorry for sending inappropriate DEM file. I apologies for your inconvenience due to my unintended mistake. The file was using EPSG 5186, not EPSG 5179..
yeah.. some files are also provided in different coordination system.. Currently in Korea we use 4 different coordination system. EPSG 5185, EPSG 5186, EPSG 5187, EPSG , EPSG5179
  • EPSG 5185, EPSG 5186, EPSG 5187
    These coordination system are TM(Tranverse Mercator) using GRS080. They are region seperated and each are having different coordinate origin.. So they are unable to cover entire country.
https://www.fpn119.co.kr/imgdata/fpn119 ... 372787.jpg
  • EPSG 5179 UTM-K
    UTM-K is also TM using GRS80 but it is able to cover entire country
Zuletzt geändert von SeungwooKim am 09.01.2023 01:35:35, insgesamt 2-mal geändert.

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Re: UTM-K[EPSG:5179] Support

#8 Beitrag von Roland Ziegler »

Thanks again, I'll test with those. Do you want me to add the 3 "belts" as well? Mutli-zone shouldn't be too much of a problem. either.

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SeungwooKim
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Re: UTM-K[EPSG:5179] Support

#9 Beitrag von SeungwooKim »

Roland Ziegler hat geschrieben: 05.01.2023 16:10:36 Thanks again, I'll test with those. Do you want me to add the 3 "belts" as well? Mutli-zone shouldn't be too much of a problem. either.
It would be grateful if you'd do so. Always thanks for your kind support :D

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#10 Beitrag von Roland Ziegler »

This looks much better now.

Single zone will report as UTM-K (EPSG:5179), tested with your sample data.

Multi-zone UTM-K, will report as UTM-K-Belts in TransDEM, with zones:
  1. West Belt (EPSG:5185)
  2. Central Belt (EPSG:5186)
  3. East Belt (EPSG:5187)
  4. East Sea Belt (EPSG:5188)
also tested with your sample data.

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Roland Ziegler
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Re: UTM-K[EPSG:5179] Support

#11 Beitrag von Roland Ziegler »

I have finally managed to release the patch to the new version, 64bit only:
Update TransDEM 2.6.2+ - 2.6.6 (64bit)

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SeungwooKim
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Re: UTM-K[EPSG:5179] Support

#12 Beitrag von SeungwooKim »

Roland Ziegler hat geschrieben: 19.02.2023 16:38:21 I have finally managed to release the patch to the new version, 64bit only:
Update TransDEM 2.6.2+ - 2.6.6 (64bit)
gonna update it right away thank you for all of your efforts

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