Strips still exist in viirs dnb after swatTogrid operation
Posted: Fri Dec 06, 2019 6:19 am
(1) I tried to remove bowtie effects in raw viirs dnb using ‘swatTogrid’ in Formulas, but there were still strips in the processed output, as showed below.
(2) how to choose and do further operations on one output from one formulas in McIDAS
In general, multi-step operations were needed to process raw satellite images, for example, raw viirs dnb (GDNBO-SVDNB_npp_d20190425_t1753089_e1758493_b38822_c20190815141605982802_noac_ops.h5).
step 1: remove bowtie in viirs dnb
The “swathTogrid” in formulas was used to remove bowtie in viirs dnb data.
[img] [/img]
step2: filter the no bowtie data from step 1
The “Gradient Image Filter” in formulas was used to filter the data without bowtie from step1. However, the output data from "step 1" did not showed in the “Field Selector”. Only the raw data could be selected to process, I did not know how to process the intermediate file outputed from one formulas.
[img] [/img]
(3) the radiance unit for the VIIRS DNB was identified incorrectly by McIDAS-V
The unit for radiance in viirs dnb was showed as “10000.0 kg.s-3”, but in fact, the right unit was W/(cm2·sr). Though “Change display unit” in Edit menu was provided in “Layer Controls”, but it got a error message by entering the correct unit manually.
[img] [/img]
Did Anyone also meet these problems, and give some help. Thanks.
(2) how to choose and do further operations on one output from one formulas in McIDAS
In general, multi-step operations were needed to process raw satellite images, for example, raw viirs dnb (GDNBO-SVDNB_npp_d20190425_t1753089_e1758493_b38822_c20190815141605982802_noac_ops.h5).
step 1: remove bowtie in viirs dnb
The “swathTogrid” in formulas was used to remove bowtie in viirs dnb data.
[img] [/img]
step2: filter the no bowtie data from step 1
The “Gradient Image Filter” in formulas was used to filter the data without bowtie from step1. However, the output data from "step 1" did not showed in the “Field Selector”. Only the raw data could be selected to process, I did not know how to process the intermediate file outputed from one formulas.
[img] [/img]
(3) the radiance unit for the VIIRS DNB was identified incorrectly by McIDAS-V
The unit for radiance in viirs dnb was showed as “10000.0 kg.s-3”, but in fact, the right unit was W/(cm2·sr). Though “Change display unit” in Edit menu was provided in “Layer Controls”, but it got a error message by entering the correct unit manually.
[img] [/img]
Did Anyone also meet these problems, and give some help. Thanks.