I suppose, you may use some parameter, which describes the vegetation, for example NDVI, because tree roots strengthen the soil layer. Also you should use topography maps, from which you detect the zones with large slope of land surface.

If using NDVI, you should take into account the vegetation cycles, so I think, that the method would be usable only in summer.

Also, it does not give information about geological structure of the territory. Maybe to estimate the danger of sliding of large masses of land, you will have more useful information from geological structure and topography maps of region.

thanks dear vastesenko

i use NDVI index & lithology also

but i think how i definition rulset that achieve the best result for our segmentation

I agree with Aleksei about the importance of the topography in landslide prone areas detection.

Land slope is the main parameter you should take into account along with the geotechnical properties of soil.

I'm not sure you can extract such information from SPOT5 imagery (or any other optical satellite) only.

ok

dear i must not only use SPOT5 or other optical image but also use DEM to analysis land slide prone area

so what we can definition rulset of this layer to detect and classify type of landslide same flow or rotational or other type???

I think you need a DTM, geological/geotecnical information and use a drone to collect high resolution images and construct a rule over all this data on Ecognition. If you are not a geotecnical expert you should get some expertise on slope stability to construct the rule.

i want to detect and classify type of landslide with object base method via Ecagnation software

i want to use SPOT 5 multi spectral & DEM 10 M,

so i don't have any experience in this topic

unless this data , which data i need, and how i can identify rulset that can receive best result

Some work has already been done and published on characterisation and detection of landslides from satellite image and DEM using object-based methods. Pl. go thorugh the link http://www.itc.nl/Pub/OOA-group/Data_and_rule_sets.html for rule set developed in eCognition to detect landslides and send the feedback!

ok

dear Martha i see you PhD thesis for detection landslide

but we able to delineation and classification type of landslide with using Ecognation?