Latest Contributions by JamalNUMAN

How to know if the raster has Nodata cells and then (if any) how to count them? thank you jamal ... View more

is there a way to label the cells of the raster with theirs values? please, see the attached image that shows the question Thank you regards Jamal ... View more

Is there a tool to convert the cells of a raster to vector? Please, see the attached raster Is there a way to get the cells on this raster to vector such that each cell becomes a square in the vector class, therefore, the vector will contains feature equal to number of cells in the raster Of course, I know the tool ???raster to polygon???, but his doesn???t give the vector with individual squares Thank you Regards Jamal ... View more

How to replace the cells that have ???no data??? with average values of the neighbor cells? Please, see the attached image that shows my question Many cells in the given raster have no data, all what we need is to fill the ???no data??? cells??? with the average values of their neighborhood We need to fill all the area bounded by magenta border. How could we do that? Thank you Regards Jamal ... View more

The clipped raster has the same cell numbers as the original one!!! Why? Please, see the attached image that shows the case (particularly the tables!!!) The clipped raster has the same cell numbers as the original one (exactly the same) despite the fact that the clipped one is just a part of the original raster!!! Of course??? really weird!!!!! What might be the problem? Thank you Regards Jamal ... View more

What is the effect of multiplying two rasters that have differnt cell size? please, see the attached image that shows my question? also, if they have the same cell size, should they be identical in the two rasters to be multiplied? what if they are of the same size in the two rasters but not identical? thank you regards Jamal ... View more

Has anyone calculate the carbon content of the forest based on an image of band4 and band5? The method: Biomass Volume = - 478.58 + 4.5041 ?? ND45 (Mt/ha) ND45 = 128 ?? ((TM4* - TM5*) / (TM4 + TM5)) + 128 Carbon = Biomass Volume ?? 0.5 (Mt/ha) Critical point: ??? The vegetation index   includes water. Then how to extract the forest from this index? Based in which values? For example, the values of the NDVI are indicative: Very low values of NDVI (0.1 and below) correspond to barren areas of rock, sand, or snow. Moderate values represent shrub and grassland (0.2 to 0.3), while high values indicate temperate and tropical rainforests (0.6 to 0.8). in this case we can extract exactly what we need. In which sense is this applicable for ND45? ??? Do we need to process the pixel values of ND45 according to the average over 11x11 pixel window? Does this affect the result and the approach? ??? As the result of this approach is a raster that contains the values of carbon at each cell in (kg/ha), then is it correct to calculate the weight of carbon at each cell by multiplying the value of that cell with its area and then to sum all of these values up?  Should we convert the area of the cell to ha (hectare) first or this is included in the equation? ??? Is this approach applicable if we have an image from Landsat ETM+? any idea? Thank you Regards Jamal ... View more

Where in the command �??Create TIN from feature�?� in ArcGIS 10? Please, see the attached image that shows my question Why the command �??Create TIN from feature�?� is not in the toolbox? or even in the pull down minue as in ArcGIS 9? Thank you ... View more