Horizontal reductions
Hello,
When I set up 100 meters for horizontal reduction , my project does not work.
This is my project link
https://drive.google.com/drive/folders/1Y5kRB5XILqdxwL-SJ8w41k3Kcfmv5EVP?usp=sharing
Thank you very much.
Nguyen
Horizontal reductions
by 
, Bad Vilbel, (1826 days ago) @ Nguyen Thanh Trung
Hello Nguyen,
When I set up 100 meters for horizontal reduction , my project does not work.
I take a look to your provided coordinate files. Here, the UTM zone number is missing and, thus, the simple check of your coordinates failed, i.e.,
if (yS >= 1100000 && yS <= 59800000 && yE >= 1100000 && yE <= 59800000) { // do reduction }
kind regards
Micha
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applied-geodesy.org - OpenSource Least-Squares Adjustment Software for Geodetic Sciences
Horizontal reductions
One question: if my UTM coordinates in 3 zone width (0.9999 scale). How to reduce to this one?
In your programing, I see you use the reduction in 6 zone width (0.9996 scale).
Horizontal reductions
by , Bad Vilbel, (1826 days ago) @ Nguyen Thanh Trung
Hi,
One question: if my UTM coordinates in 3 zone width (0.9999 scale). How to reduce to this one?
The zone width is defined to 6°, cf. UTM zone definition. If you have a special (local) projection, you have to reduce the distances by your own, defined by your special crs.
Please note, all projections are applied only to horizontal distances (but not to slope distances!).
/Micha
--
applied-geodesy.org - OpenSource Least-Squares Adjustment Software for Geodetic Sciences