Truong Sinh

When I load the roughness WAsP map, a popup window appears with the following information: "A "twin-line node" - with a pair of matching roughness lines - is encountered, at: (.....) It can readily be resolved by joining the two lines. It is recommended to resolve twin-nodes automatically. Do you accept auto twin-line node resolving by joining the matching roughness lines?" When I clicked “No,” it displayed the Cross points error. When I clicked “Yes,” I saw the same result as in your previous capture. Thank you for your clarification and suggestion on resolving this issue.

Hi Rogier, Please see map in this link: https://drive.google.com/drive/folders/19XUF6dFftUT-LeOY1R8szx7LWpnkqsIJ?usp=sharing Many thanks

Hi all, I am currently working with Wasp scripting in QGIS and utilizing the “Get Worldcover land cover process” tool, followed by “Polygons to roughness lines” and “Save WasP roughness lines.” Upon reviewing the exported roughness WAsP map file, I have encountered several cross points errors. It appears these errors occur at points where two polygons with the same z0 value intersect. I have a few questions regarding this issue: Should we validate the roughness WAsP map using the WAsP Map Editor for dead-ends, cross points, and LFR-errors, or is this validation only necessary when importing a Rough-ASC map (*.asc)? If validation is recommended and cross points errors are detected in the WME, what steps can we take in QGIS to resolve these errors before exporting? Best regards,