At 22-05-2015 01:06 Friday, cascafico wrote:
Springfield Harrison wrote > As a 30+ year helicopter pilot, I did have some concern with the very > skimpy helipad instructions. In high-altitude, rugged terrain there is > much more to locating helipads than finding a 30 m flat square of ground. > Is there any technical oversight by experienced pilots on this task? > I assume that there are no current maps for this area, just the OSM edits? > I did find some ASM 1950s mapping. Is there nothing newer than that?
Hello cascafico,
That does sound like an interesting approach. Not sure how well the NIR data would identify suitable landing surfaces but it might be a good start. Some sense of the topography is important, the OSM imagery is not really very good for that.
One of the first exercises during remote sensing lessons is closely related to your concerns: identify potential landing spots using digital terrain model and near infra-red imagery. It's pretty simple. I wonder why some GIS people didn't automate that, say conditional 10° slope, slope direction, elevation<11.000 ft and scrub free land ...maybe no NIR data available? JOSM crowd should be aware of the 30 m DEM TMS available since 20150506 [1] before mapping potential landings... it's very useful, even without vegetation data. [1] http://gis.19327.n5.nabble.com/30-m-DEM-TMS-rendering-for-Nepal-td5843573.html ----- -- cascafico.altervista.org twitter.com/cascafico -- View this message in context: http://gis.19327.n5.nabble.com/newbie-needs-advice-tp5843387p5845528.html Sent from the Humanitarian OpenStreetMap (HOT) mailing list archive at Nabble.com. _______________________________________________ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
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