Latest Contributions by MarkEnglish

I'm working on preprocessing two polygon layers by simplifying their attributes to include only the elevations.  The two polygons don't follow the same extents, for example, they don't line up exactly.  I'd like to compare the two to find out if the elevation increased or decreased, and kick out an output polygon for display.  What approach should I take or tool should I use to conduct this analysis? I also have the option of converting the two polygons to raster, and running the analysis as raster based data.  Any thoughts on this are also welcomed. Best! ... View more

Hello:  I am beggining a project that requires an index grid.  I basically would like to generate three grids (polygon) that cover my project area at 1 mille, 10 miles, and 100 miles.  I don't need it to follow any pre-existing boundaries, although its required to cover my project area.  Oh, and I"m still using 9.3.1?  Thanks in advance. Mark ... View more

I have two seperate raster datasets with one value per pixel, and need to calcuate the difference in an output raster.  Is there a way to perform this simple calculation using two seperate rasters. Thanks! ... View more

Is there an example of an input geocoding table with the format prefered by the geocoding tool?  I"ve been searching everywhere, but haven't found a table in the prefered schema.  Thanks in advance. Mark ... View more

If I already have the linear referenced data for linear features, how do I display their offset symbology in ArcMap?  This dataset relies on two fields for uniqueness.  Is their a method to distinguish the combinations of two fields in the display?  Thanks! ... View more

I have a line feature class in which I need to extract measurements based on a pre-existing point feature class.  So, for each point on the line, I need to find its measurement along the line.  I need to create measurements along the line using the Create Routes tool.  My data is in a Lambert projection (feet), although I need for the point measurements along the line to be captured in decimal degrees. Also, I am using stream data, which flows from all directions.  I used the Create Routes tool to quality assess the direction 0 to 1234, and noticed many of the streams were calculating distance from the wrong end.  Is there a way to automate this process potentially through elevation, or possibly another means? Thanks in advance for your time! ... View more

Hello: I am in the preliminary stages of investigating habitat suitability models.  My approach is to utilize various geospatial data such as soil type, elevation, vegetation, climate, urban areas, infrastructure, etc., and assign weighting variables associated with each targeted habitat species.  Using red squirrels for example:  What they forage and where they den (vegetation), their elevation range, their prefered climate, etc.  This details of this information will be derived from local biologist.  My first instinct is to review other projects similar to this, because it seems this work has been done.  My question is, does anyone know of existing models, an appropriate place to begin, or helpful resource?  Thanks so much for your time! ... View more