Dear Mr/Mrs. Prasad Babu, The accuracy (e.g. the RMS) will depend greatly on the parameters (weight function, exponent, limiting distance) that you have set for the moving average method. Moreover the terrain relief and the density and distribution of the sampled points influence it as well. What do the numbers 2000 and 100 in your letter mean precisely? Jan Hendrikse ILWIS development
-----Original Message----- From: Prasad Babu mt ce [mailto:[EMAIL PROTECTED] Sent: Tue 25/02/2003 04:16 To: Ilwis list Cc: Subject: (ilwis-list) reg. accuracy of DEM. Dear Sir, Greetings to all, I would like to know the what is the best accuracy of DEM, with respect to point interpolation in Ilwis. we collecte spot height data from 1:50,000 toposheets and interpolated (moving average),we got RMS error around 1.34 meters for the points 2000, and sample points 100. If anyone sugest, what is the method to improve quality of DEM and is that error is normal or not? If anyone have some supported papers or article regarding accuracy analysis and standards in Ilwis, please send it to me either in hard or soft. I am very much grateful to you.. Yours sincerely G.prasad Babu ---------------------------------------------------------------------------- G.PRASAD BABU M.TECH,ENGG. GEOLOGY DEPT. OF CIVIL ENGG. C - 311,HALL-5, IIT KANPUR KANPUR - 208 016. ************************************************** Email: [EMAIL PROTECTED] [EMAIL PROTECTED] ******************************************************** ph:0512-597317 (off) 597315 (hostel) ---------------------------------------------------------------------------- Love suffers long and is kind; love does not envy; love does not parade itself, is not puffed up; does not behave rudely, does not seek its own, is not provoked, thinks no evil; does not rejoice in iniquity, but rejoice in the truth; bears all things, believes all things, hopes all things, endures all things. Love never fails. But whether there are prophecies, they will fail; whether there are tongues, they will cease; whether there is knowledge, it will vanish away. I Corinthians 13:4-8 ****************************************************************************** ________________________________________________________ To leave the ILWIS-LIST discussion list, send a email with 'unsubscribe ilwis-list' in the body to '[EMAIL PROTECTED]' ��z�^ ��H�Mجr�,����lzwZzf�����칻 �&ފ\"�X��)���w+h�+-���z��ry
