[talk-ph] ASTER GDEM is now released for civilian use!

[Eugene Alvin Villar]

Hi maning. Well, why don't you do your evaluation again for V2? It's
supposed to be much more improved than v1 since they collected a lot
more data. :)

On Sat, Oct 22, 2011 at 10:05 PM, maning sambale
<emmanuel.sambale at gmail.com> wrote:
> We had an internal evaluation of this dataset (v1) a while back, it
> has a several data issues such as too much noise, molehills and
> unknown depressions in our test area.
>
> We concluded that as per V1, it is better to use the SRTM dataset.
>
> And another thing consider:
>
> "To let people know before they spend a lot of time downloading the new
> ASTER GDEM: this new data has a grid spacing of 1 arcsecond (~30 m), but
> the actual resolution is closer to about 120 m because they used a 9x9
> pixel matching window on the ASTER 15 m images to extract the
> topography. The resolution and accuracy in most locations is not as good
> as the SRTM 3-arcesecond DEM, but it does have useful data in many of
> the locations where SRTM has voids."
>
> I don't know if this has improved already for V2.
>
>
> On Sat, Oct 22, 2011 at 9:27 PM, Eugene Alvin Villar <seav80 at gmail.com> wrote:
>> Hi guys,
>>
>> Exciting map geek news! Version 2 of the ASTER GDEM data[1] has just been
>> officially released for civilian use![2]
>>
>> Some of you may have been aware of the ASTER GDEM map data that was released
>> back in 2009 (Version 1). This data contains the 3D elevation of 99% of the
>> earth at a resolution of 30 meters. This is 9 times more dense than the
>> SRTM3 data (90m resolution) that is the default data used in Google Earth.
>> However, version 1 was only released as raw data only fit for scientific
>> research. In version 2, they have clean the data and it can now be used by
>> the general public. :)
>>
>> I once played with GTOPO30 and SRTM3 data to create topographic maps[3] and
>> I think the ASTER data would be interesting to play around with. :)
>>
>> [1] http://www.gdem.aster.ersdac.or.jp/
>> [2] http://www.wired.co.uk/news/archive/2011-10/19/nasa-elevation-map
>> [3] http://vaes9.codedgraphic.com/posts/topomaps_using_srtm3_data
>>
>
> --
> cheers,
> maning