[HOT] 30 m DEM TMS rendering for Nepal

Jean-Guilhem Cailton jgc at arkemie.com
Fri May 8 12:16:54 UTC 2015


Bonjour,

Actually, it is the other way around, as can be guessed from a global
view: flat areas appear in black.

So the lighter the grey, the steeper the slope.

It can indeed be very useful as a parameter for potential helicopter
landing zones. Areas reported on APAN as landing zones used by USMC do
appear in black.

Best wishes,

Jean-Guilhem


Le 08/05/2015 13:26, piz a écrit :
> Bonjour and thanks a lot!
> I suppose the lighter the grey the more flat the slope, this will greatly help for finding helicop. landing areas
>
>
>
> ~~~~~~~~ quote of the day ~~~~~~~~~~~~~
> "You shall above all things be glad and young"
>                           (E.E. Cummings)
>
>
> -- In data venerdì 8 maggio 2015 06:57:28, Jean-Guilhem Cailton ha scritto:
>> Buongiorno,
>>
>> Good idea. Here you go, Nepal slope map, thanks again to gdaldem:
>> URL for JOSM is:
>> tms:http://imagery.openstreetmap.fr/tms/1.0.0/nepal_slope/{zoom}/{x}/{y}
>> and for iD:
>> http://imagery.openstreetmap.fr/tms/1.0.0/nepal_slope/{z}/{x}/{y}
>>
>> And previous rendering, with hillshading computed with a vertical
>> exaggeration of 3 times (on elevations multiplied by 3):
>> URL for JOSM is:
>> tms:http://imagery.openstreetmap.fr/tms/1.0.0/nepal_dem_x3/{zoom}/{x}/{y}
>> and for iD:
>> http://imagery.openstreetmap.fr/tms/1.0.0/nepal_dem_x3/{z}/{x}/{y}
>>
>> Best wishes,
>>
>> Jean-Guilhem
>>
>>
>> Le 07/05/2015 12:59, piz a écrit :
>>> wonderfull
>>> and now why not to derive from the DEM a slope map?
>>>
>>>
>>>
>>> ~~~~~~~~ quote of the day ~~~~~~~~~~~~~
>>> “I'll make him an offer he can't refuse”
>>>      (Mario Puzo - "The Godfather")
>>>
>>>
>>> -- In data giovedì 7 maggio 2015 00:28:06, Jean-Guilhem Cailton ha scritto:
>>>> Hi,
>>>>
>>>> The same DEM rendering now covers all of Nepal.
>>>>
>>>> URL for JOSM is:
>>>> tms:http://imagery.openstreetmap.fr/tms/1.0.0/nepal_dem/{zoom}/{x}/{y}
>>>>
>>>> and for iD:
>>>> http://imagery.openstreetmap.fr/tms/1.0.0/nepal_dem/{z}/{x}/{y}
>>>>
>>>> Best wishes,
>>>>
>>>> Jean-Guilhem
>>>>
>>>>
>>>> Le 06/05/2015 22:24, piz a écrit :
>>>>> I was thinking about the same rendering but didn't know about USGS data licensing
>>>>>
>>>>> I think that the DEM should be used for evaluating helicopter landing areas
>>>>>
>>>>> best
>>>>> Roberto
>>>>>
>>>>>
>>>>>
>>>>> ~~~~~~~~ quote of the day ~~~~~~~~~~~~~
>>>>> "Yeah, yeah, life sucks and then you die"
>>>>> (Bret Easton Ellis - Pat Bateman "American Psycho")
>>>>>
>>>>>
>>>>> -- In data mercoledì 6 maggio 2015 20:42:16, Jean-Guilhem Cailton ha scritto:
>>>>>> Hi,
>>>>>>
>>>>>> Needing a DEM background for some task, I've prepared a rendering from
>>>>>> the 30m SRTM DEM data made available by USGS for Central Nepal on HDX,
>>>>>> and shared it as TMS it in case it could useful to others too. Note that
>>>>>> it is not void-filled ("The voids occur in areas where the initial
>>>>>> processing did not meet quality specifications").
>>>>>>
>>>>>> URL for JOSM is:
>>>>>> tms:http://imagery.openstreetmap.fr/tms/1.0.0/nepal_central_dem/{zoom}/{x}/{y}
>>>>>>
>>>>>> and for iD:
>>>>>> tms:http://imagery.openstreetmap.fr/tms/1.0.0/nepal_central_dem/{z}/{x}/{y}
>>>>>>
>>>>>>
>>>>>> The color ramp used follows the rainbow, for visual contrast (and also
>>>>>> for the spiritual symbol):
>>>>>>
>>>>>> 0 m : black
>>>>>> 1000 m : blue
>>>>>> 2000 m : cyan
>>>>>> 3000 m : green
>>>>>> 4000 m : yellow
>>>>>> 5000 m : red
>>>>>> 6000 m : white
>>>>>>
>>>>>>
>>>>>> This only covers Central Nepal for now (N27E83 to N28E85). Please let me
>>>>>> know if you'd like extended coverage (in particular to the East, or for
>>>>>> entire Nepal), or have other suggestions or comments.
>>>>>>
>>>>>> Best wishes,
>>>>>>
>>>>>> Jean-Guilhem
>>>>>>
>>>>>>
>>>>>>
>>
>>
> _______________________________________________
> HOT mailing list
> HOT at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/hot





More information about the HOT mailing list