SARPROZ © | sekhar | Activity https://www.sarproz.com/members/sekhar/activity/ Activity feed for sekhar. Sun, 12 Apr 2026 09:27:57 -0500 https://buddypress.org/?v= en-US 30 hourly 2 5c6ee7ac8c1969494fb23cae659892fa sekhar started the topic Is heading angle in 'SiteDescription.txt' file +ve w.r.t to geographic north? in the forum Sarproz Forum https://www.sarproz.com/groups/sarproz-group/forum/topic/is-heading-angle-in-sitedescription-txt-file-ve-w-r-t-to-geographic-north/ Wed, 27 Jun 2018 07:59:01 -0500 In the SiteDescription.txt file, I have observed a value for ‘AcqHeading’. I believe this as the heading or azimuth angle of the satellite. If so, is it calculated positive with respect to the geographic north?
For a particular S1 dataset acquired in ascending mode (track 72 over Iran), ESA SNAP software shows platform_heading_angle = -129.6 deg…[Read more]

]]> 546d2f74f9e55d9569179d3e92de4e0c sekhar replied to the topic Reflectivity Min and Max values and units in the forum Sarproz Forum https://www.sarproz.com/groups/sarproz-group/forum/topic/reflectivity-min-and-max-values-and-units/#post-2419 Tue, 29 Aug 2017 04:57:08 -0500 Thanks. This information is very helpful.

]]> ae62fd89fe3fd1fd62328d570c9b3f10 sekhar started the topic Reflectivity Min and Max values and units in the forum Sarproz Forum https://www.sarproz.com/groups/sarproz-group/forum/topic/reflectivity-min-and-max-values-and-units/ Mon, 28 Aug 2017 11:17:01 -0500 Hello Team,

I came across a parameter ‘Reflectivity’ is Load Mask option. I would like to know what are the max and min values possible for reflectivity. What are its units?

-sekhar

]]> 27a2fc943395810b274d4aef971bdb4e sekhar replied to the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum http://www.sarproz.com/groups/sarproz-group/forum/topic/psc-interpretation-based-on-amplitude-stablity-index-for-rs2-images/#post-2110 Sat, 01 Apr 2017 11:37:50 -0500 Hi Daniele,

As per your suggestion, I have processed RS2 images (HH polarization) and got some results. I have observed subsidence over urban areas. Now I want to process same images with VV polarization to see how different would be the results. But when I tried this, slaves are not being extracted. The software shows ‘preparing extracted slaves…[Read more]

]]> 4f34982dcf4037d40135a63afd1b8ead sekhar replied to the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum https://www.sarproz.com/groups/sarproz-group/forum/topic/psc-interpretation-based-on-amplitude-stablity-index-for-rs2-images/#post-2103 Thu, 30 Mar 2017 05:55:54 -0500 Hi Daniele,

Thanks for your reply.

How should I apply spatial filtering to interferograms? What options I should choose?

Usually I follow the below procedure:

1. Generate interferograms (flat earth phase and DEM removal, goldstein phase filtering, no unwrapping)
2. APS processing (one-star graph, amplitude stability index, estimate linear…[Read more]

]]> d662981e56b8cf7bd6020f16c74d56c1 sekhar started the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum http://www.sarproz.com/groups/sarproz-group/forum/topic/psc-interpretation-based-on-amplitude-stablity-index-for-rs2-images/ Wed, 29 Mar 2017 06:33:54 -0500 Dear Sarproz Team,

I am processing nine RS2 images to study temporal deformation over an area. In APS module > Sparse point selection group, I have selected Amp. Stb. Index > 0.6 and plotted PSC. The figure shows some horizontal and vertical lines along which the PS density is high. I could not see any kind of such pattern in my reflectivity map…[Read more]

]]> ec71f9a4cbaafdf98b16297eb65ee34d sekhar replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum http://www.sarproz.com/groups/sarproz-group/forum/topic/amplitude-stability-index-in-sarproz/#post-2095 Sat, 25 Mar 2017 10:23:50 -0500 Thanks a lot for clarification..

]]> 0657db6b86e319153089a9fa02d45fba sekhar started the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum http://www.sarproz.com/groups/sarproz-group/forum/topic/amplitude-stability-index-in-sarproz/ Sat, 25 Mar 2017 09:52:13 -0500 I have few queries regarding PS point selection criteria in SARproZ.
1. In APS module > Sprase Point Selection Parameter, Amplitude Dispersion is termed as Amplitude Stability. Am I right?
2. How can I relate Amplitude Dispersion (mu/sigma) to Amplitude Stability Index (1-(sigma/mu)). For example, How can I select PSC with Amp. Dispersion <…[Read more]

]]> 9e8356d96118b650b6c8f9b15829f1e6 sekhar became a registered member https://www.sarproz.com/activity/p/1535/ Sat, 25 Mar 2017 09:14:38 -0500 0