Hi Frank- I'm also very interested in this topic and have been trying to efficiently create raster images from continuous oracle point sources. Currently, I write the Oracle points to a ArcInfo ASCII grid and create all of my own CLASS directives for MapServer. Do you know of a better way to do this? Problem is: I need the raster to come from a DB query input by the user, so I can't create static images ahead of time...
Thanks! Chris -----Original Message----- From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On Behalf Of Frank Warmerdam Sent: Monday, January 16, 2006 12:03 PM To: [email protected] Subject: Re: [UMN_MAPSERVER-USERS] negative values and colors in Ascii Grids On 1/16/06, Carola Jesch <[EMAIL PROTECTED]> wrote: > Hi Frank, > I had a look to the raster-howto and the sources as well, but was unsure, > because I can't imagine that most users have grids that exactly have values > between 0 and 255 in it. Carola, Well, most folks are working with simple 8bit images where scaling is not required. > So sorry fot the questions. > Do you plan to implement a colormap for ascii grids like the clr for binary > grids? I wasn't planning to do so, but it looks like it wouldn't be too hard. Note that ASCII grids are a terrible format to run mapserver from due to the amount of processing required when reading it. > What would you suggest to display the negative values? If you want detailed control of the colors then create a series of classes. If a greyscale is fine then just use automatic or explicit scaling values. Best regards, -- ---------------------------------------+-------------------------------- ------ I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent
