Hi Roberto,
Yes, that is correct. spdmccgrd and spdpmfgrd only assign points to ground and
spdinterp and spddefgrd just consider ground / non-ground returns.
Cheers, Pete
****************************************************
* Dr Pete Bunting
* Senior Lecturer in Remote Sensing
* Earth Observation and Ecosystem Dynamics Group
* Department of Geography and Earth Sciences
* Aberystwyth University
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*
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On 24 Sep 2014, at 22:12, Roberto Antolín <[email protected]> wrote:
> Hi Pete,
> Are you saying that the only classification that pmf and mcc assign is
> "ground"? That explains lots of things :)
>
> So, I guess that the data I have with "high vegetation" class was
> already classified before applying spdpmfgrd and spdmccgrd, right?
>
> Then, what happens with spddefheight and spdinterp? I suppose they use
> ground and no-ground points in order to define the reference surface
> for height definition and the DSM, DTM and CHM, respectively.
>
> Cheers,
> Roberto
>
> 2014-09-24 19:45 GMT+02:00 Pete Bunting <[email protected]>:
>> Hi Roberto,
>>
>> I am not sure what is going on there. There haven’t been any chances to that
>> code over the period you talk about. However, I think the difference is more
>> likely to be with your input data. The spdmccgrd and spdpmfgrd commands do
>> not try to classify vegetation or any other classes only ground but if
>> returns have a classification before they are entered into spdmccgrd or
>> spdpmfgrd then only the points which are classified at some point with the
>> processing as ground are changed. In the final classification not all point
>> may end up as ground, if they are only ground at an intermediate stage then
>> those points will be assigned as unclassified. Therefore, you will commonly
>> see quite a few unclassified returns near the ground.
>>
>> If you want to test it or to ‘clean’ your data before using spdlib to
>> classify it then you can use the spdclearclass command to assign all returns
>> to the class ‘unclassified’.
>>
>> I hope that helps, let me know if it doesn’t make sense or this is not what
>> you are seeing.
>>
>> Cheers, Pete
>>
>>
>> On 24 Sep 2014, at 16:57, Roberto Antolín <[email protected]> wrote:
>>
>>> Hello all,
>>> I have recently noticed that PMF and MCC algorithms do not classify
>>> vegetation properly. The output spd files has two (some times three)
>>> different classes: "ground" and "unclassified" ("low vegetation" in
>>> some rare cases). None of them are "vegetation"
>>>
>>> Since I have not updated my spdlib version for a long time, I checked
>>> the files I processed months ago. As far as I know, this issue is
>>> going on since May.
>>>
>>> Any hint?
>>>
>>> --
>>> Roberto
>>>
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>>
>
>
>
> --
> Roberto
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