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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
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04-12-2011
02:13 AM
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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
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04-11-2011
01:20 PM
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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
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04-06-2011
02:40 PM
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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
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03-03-2011
01:49 PM
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the command "Reclassify" gives wring result! Why? Please, see the attached image that shows my question I tried to reclassify the raster to 7 classes, but I got 7 classes and another one which I couldn???t know what it is!!! How to solve this problem so that I can have only 7 classes? Thank you
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02-26-2011
03:30 PM
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How to buffer the raster according the certain value of the cell? Please, see the attached image that shows my question I need to get a raster that represent a buffer of 500 m from the built up area (which have the cell value number 3). If the same problem is in vector, I use the buffer command then erase command. What are the equivalent commands for raster?
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02-18-2011
02:04 PM
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Is the command �??location allocation�?� existing in ArcGIS as in ArcInfo Worksation? The command location allocation find the best site location for facilities based on: The demand in each polygon The minim travel distance Assuming the number of facilities In ArcInfo workstation, if these data are given, then the best locations of facilities are plotted alongside with the spider showing the relation between each polygon and the facility Please, see the attached image This is different from the location allocation exisiting in Network analyst! what is the equivelent command in ArcGIS? Thank you
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02-09-2011
02:49 PM
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How to convert the file of the extension *.e00? Please, see the attached image that shows my question Is there a way to convert the file *.e00 to shape file or raster?
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02-01-2011
08:59 AM
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ArcGIS 10: is the location allocation just only choose the new locations based on the existing ones or suggest new location totally different from the excising ones Please, see the attached image that explains my question Here, i have: ??? 47 demand point ??? 9 facilities to cover the demands ??? I need to make the number of facilities 3 I found that the system choose these from the existing 9 facilities and doesn???t suggest any new location! How to make the system suggest new locations for the facilities that not necessarily to be from the existing ones?
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01-29-2011
02:30 AM
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Hello, how to accumulate the values of field using VBA ??? Arcobject? Please, see the attached image that shows my question Any help is very much appreciated Regards kalid
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12-11-2010
01:20 AM
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Hello, How to print the fields of table in textbox in form using VBA ??? Arcobject? Please, see the attached image that shows my question Any help is very much appreciated Regards kalid
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12-11-2010
01:06 AM
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Hello, How to write a code that does the ???frequency??? for a field in attribute table of a layer using the VBA ??? Arcobjects? Please, see the attached image that shows my question Thank you Regards Kalid
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12-10-2010
04:46 PM
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Hello Venkat, Thank you very much for the code. It would be very much appreciated if you develop the code so that: �?� First to intersect the layer of hospital with the layer of district (both are polygon) �?� Then to have the frequency in the table of the intersected layer so that we know the number of hospitals in each district In this case: We don�??t need to start editing and to have the field �??name�?� in the district layer in order to get the result (as it�??s in the provided code) Thank you Regards Kalid hi, How do you intersect point and polygon...You are looking for Points within the polygon ?if that is true i have already given you the code that perfectly working...please check previous forms Thanks
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12-10-2010
12:29 PM
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Dear Venkat, Thank you so much for the answer. It�??s really helpful Sure. The code you have developed is working perfectly. 1. how to develop the code so that we don�??t need: �?� To work in edit session. �?� To have the field �??name�?� in the district layer. 2. How to develop the code considering the following approach: �?� to intersect the two layers (districts and hospitals: both are polygons) �?� And then to make summery in the table of the resultant layer (from the intersection) so that we count all the hospitals in each district. I�??m supposed to print the result in the form and then to be able to export it to a table to excel Please, see the attached file Appreciated Kalid Hi, please check below code... Sub test() Dim pMxDoc As IMxDocument Set pMxDoc = ThisDocument Dim pPolyFLayer As IFeatureLayer Set pPolyFLayer = pMxDoc.FocusMap.Layer(1) Dim pPointFlayer As IFeatureLayer Set pPointFlayer = pMxDoc.FocusMap.Layer(0) Dim pEditor As IEditor, pUID As New UID pUID.Value = "esricore.Editor" Set pEditor = Application.FindExtensionByCLSID(pUID) If pEditor.EditState = esriStateEditing Then pEditor.StartOperation CountFeatures pPolyFLayer.FeatureClass, pPointFlayer.FeatureClass, _ esriSpatialRelContains, "NAME" pEditor.StopOperation "PolygonDensity" Else MsgBox "no edit session" End If End Sub Sub CountFeatures(pFC1 As IFeatureClass, _ pFC2 As IFeatureClass, _ lSpatialRel As esriSpatialRelEnum, _ strCountFld As String) Dim pFCur As IFeatureCursor Set pFCur = pFC1.Search(Nothing, False) Dim lFld As Long lFld = pFC1.FindField(strCountFld) If lFld = -1 Then MsgBox "field not found: " & strCountFld Exit Sub End If Dim pFeat As IFeature Set pFeat = pFCur.NextFeature Do While Not pFeat Is Nothing Dim pSF As ISpatialFilter Set pSF = New SpatialFilter Set pSF.Geometry = pFeat.ShapeCopy pSF.SpatialRel = lSpatialRel pSF.GeometryField = pFC2.ShapeFieldName pFeat.Value(lFld) = pFC2.FeatureCount(pSF) MsgBox "OID: " & pFeat.OID & ", count: " & pFeat.Value(lFld) pFeat.Store Set pFeat = pFCur.NextFeature Loop End Sub is that your looking for ?... Thanks and Regards, Venkat
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12-10-2010
11:21 AM
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Hello, I need to write a code (in VBA- Arcobjects) to intersect two layers (both are polygons) and then to make summery Please, see the attached image that shows my question ??? The first layer represents the boundaries of the district ??? The second layer represents the hospital ??? First i need to intersect the two layers ??? Then, I need to count the number of hospitals in (inside) each governorate Thank you Kalid
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12-09-2010
09:31 AM
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