MOLA Interpolation     Isis Support Center Forum Index » Planetary GIS Datasets - Mars » MOLA Interpolation View previous topic :: View next topic   Author Message byrnepk Osiris (Active Member) Joined: 26 Jan 2006 Posts: 12 Location: Trinity College, Dublin   Posted: Thu Mar 16, 2006 11:01 am    Post subject: MOLA Interpolation I'm generating contours from the 128-bit MOLA jazz in ArcScene using 3D Analyst. Does the fact that the cell size in the MOLA data is 463m have any bearing on the accuracy of the generated contours? i.e. I've generated contour intervals of 250m and 100m, and the latter better delineates the features I'm looking at. But I'm slightly concerned as to the fidelity of the smaller-interval contours — can I rely on them as much as any other interval set of contours? Indeed, is there an optimum interval? Thanks! Paul  Back to top » thare GIS Support Team Joined: 22 Mar 2004 Posts: 663 Location: USGS Astrogeology Research Program, Flagstaff, AZ   Posted: Fri Mar 17, 2006 8:27 am    Post subject: ESRI products generate what is called engineering contours, meaning that they follow the pixels fairly precisely - corners and all. That means that they don’t always look very smooth but they are accurate and repeatable. You don’t want to crazy on the interval, but a 100 m interval is reasonable for smaller areas. They just might get a little jaggy and closely spaced but they will be as accurate as the data allows. To help cleanup the files you can try to smooth them after they are created. And for we usually actually add a length field and then select and remove all the "speckle" contours by removing the lines with small lengths. These are usually just tiny closed values surrounding single pixels. Also for the polar areas, the resolution can be as good as ~115 m/p. So higher density can be used for those areas. Trent  Back to top » Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Isis Support Center Forum Index » Planetary GIS Datasets - Mars » MOLA Interpolation     All times are GMT - 7 Hours Page 1 of 1   Jump to: Select a forum The Isis Support Center----------------Policies & Announcements Isis 3----------------Isis 3 SupportInstallation Support for Isis 3Tips & Tricks for Using Isis 3Bug Reports for Isis 3Chat about Isis 3 Isis 2----------------Isis 2 SupportTips & Tricks for Isis 2Installation Support for Isis 2Bug Reports for Isis 2Chat about Isis 2 Planetary GIS Discussions----------------GIS ApplicationsGIS and IsisPlanetary GIS Datasets - MarsPlanetary GIS Datasets - Other Other Topics----------------Isis Web: Comments & Questions  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum

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