{"id":1154,"date":"2024-01-20T23:19:00","date_gmt":"2024-01-20T23:19:00","guid":{"rendered":"https:\/\/science.gsfc.nasa.gov\/stella\/?p=1154"},"modified":"2025-07-05T02:45:06","modified_gmt":"2025-07-05T02:45:06","slug":"field-comparison-asd-and-stella-8-22-2023","status":"publish","type":"post","link":"https:\/\/science.gsfc.nasa.gov\/stella\/field-comparison-asd-and-stella-8-22-2023\/","title":{"rendered":"Field Comparison ASD and STELLA 8\/22\/2023"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1154\" class=\"elementor elementor-1154\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3208000 e-flex e-con-boxed e-con e-parent\" data-id=\"3208000\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c4370ac elementor-widget elementor-widget-heading\" data-id=\"c4370ac\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Field Comparison ASD and STELLA 8\/22\/2023<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-56cd3e1 e-flex e-con-boxed e-con e-parent\" data-id=\"56cd3e1\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-fd5a29f e-con-full e-flex e-con e-child\" data-id=\"fd5a29f\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ea1233b elementor-widget elementor-widget-text-editor\" data-id=\"ea1233b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>Preliminary Results Created by Dr. Petya Campbell, STELLA \u00a0Lead Scientist<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c422cad e-con-full e-flex e-con e-child\" data-id=\"c422cad\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4a2722b elementor-widget__width-inherit elementor-widget elementor-widget-premium-addon-image-button\" data-id=\"4a2722b\" data-element_type=\"widget\" data-widget_type=\"premium-addon-image-button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t<a class=\"premium-image-button-none premium-image-button premium-btn-sm premium-image-button-none\" href=\"\/wp-content\/uploads\/2025\/05\/Field-Day-8.22.23.zip\">\n\t\t\t<div class=\"premium-image-button-text-icon-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<svg class=\"premium-svg-nodraw premium-drawable-icon e-font-icon-svg e-fas-file-excel\" aria-hidden=\"true\" viewBox=\"0 0 384 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M224 136V0H24C10.7 0 0 10.7 0 24v464c0 13.3 10.7 24 24 24h336c13.3 0 24-10.7 24-24V160H248c-13.2 0-24-10.8-24-24zm60.1 106.5L224 336l60.1 93.5c5.1 8-.6 18.5-10.1 18.5h-34.9c-4.4 0-8.5-2.4-10.6-6.3C208.9 405.5 192 373 192 373c-6.4 14.8-10 20-36.6 68.8-2.1 3.9-6.1 6.3-10.5 6.3H110c-9.5 0-15.2-10.5-10.1-18.5l60.3-93.5-60.3-93.5c-5.2-8 .6-18.5 10.1-18.5h34.8c4.4 0 8.5 2.4 10.6 6.3 26.1 48.8 20 33.6 36.6 68.5 0 0 6.1-11.7 36.6-68.5 2.1-3.9 6.2-6.3 10.6-6.3H274c9.5-.1 15.2 10.4 10.1 18.4zM384 121.9v6.1H256V0h6.1c6.4 0 12.5 2.5 17 7l97.9 98c4.5 4.5 7 10.6 7 16.9z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t<span >\n\t\t\t\t\t\tDownload STELLA Field Data 8\/22\/2023 XLSX\t\t\t\t\t<\/span>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/a>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9f8968f e-flex e-con-boxed e-con e-parent\" data-id=\"9f8968f\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3b62287 elementor-widget elementor-widget-heading\" data-id=\"3b62287\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ASD Reflectance Measurements\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-78282fa elementor-widget elementor-widget-image\" data-id=\"78282fa\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/science.gsfc.nasa.gov\/stella\/\/wp-content\/uploads\/2024\/01\/ASD_Measurements.png\" data-elementor-open-lightbox=\"yes\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTE2MywidXJsIjoiaHR0cHM6XC9cL3NjaWVuY2UuZ3NmYy5uYXNhLmdvdlwvc3RlbGxhXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wMVwvQVNEX01lYXN1cmVtZW50cy5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"843\" height=\"428\" src=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-1024x520.png\" class=\"attachment-large size-large wp-image-1163\" alt=\"ASD Measurements\" srcset=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-1024x520.png 1024w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-300x152.png 300w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-768x390.png 768w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-1536x779.png 1536w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ASD_Measurements-2048x1039.png 2048w\" sizes=\"(max-width: 843px) 100vw, 843px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-115b2fa elementor-widget elementor-widget-text-editor\" data-id=\"115b2fa\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>The R spectra appears relatively clean, however in the water absorption bands (~ 1400 nm and 1900 nm) we can clearly see the effects of the varying aerosols in the air during the collection. The data was collected by measuring panel and target as a \u2018sandwich\u2019, which helped.<\/li><li>Corn R varied in the VIS, NIR and SWIR regions, related to canopy greenness, LAI and structural compounds.<\/li><li>Soybean R varied mostly in the NIR (related to canopy density and LAI)<\/li><li>In general, larger variation in canopy R was observed for corn as compared to soybean<\/li><li>Looking at the reflectance of the grass and dead vegetation (residue) you can see a slight red-edge feature in the D1 reflectance<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-69dea06 elementor-widget elementor-widget-heading\" data-id=\"69dea06\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">STELLA Bands - variation during the measurements\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ff9f67 elementor-widget elementor-widget-image\" data-id=\"3ff9f67\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/science.gsfc.nasa.gov\/stella\/\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation.png\" data-elementor-open-lightbox=\"yes\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTE2NCwidXJsIjoiaHR0cHM6XC9cL3NjaWVuY2UuZ3NmYy5uYXNhLmdvdlwvc3RlbGxhXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDI0XC8wMVwvU1RFTExBX0JhbmRzX1ZhcmlhdGlvbi5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"843\" height=\"411\" src=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-1024x499.png\" class=\"attachment-large size-large wp-image-1164\" alt=\"STELLA Bands Variation\" srcset=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-1024x499.png 1024w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-300x146.png 300w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-768x374.png 768w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-1536x749.png 1536w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/STELLA_Bands_Variation-2048x998.png 2048w\" sizes=\"(max-width: 843px) 100vw, 843px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a63efe4 elementor-widget elementor-widget-text-editor\" data-id=\"a63efe4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>With Stella we collected 20 consecutive measurements at each band.<\/li><li>NIR band 680 shows the least variation during the data collection, however all other bands show higher variation in the beginning and very end of the set of measurements in the collection.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92726dc elementor-widget elementor-widget-heading\" data-id=\"92726dc\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Preliminary Comparison of STELLA and ASD\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c86a3b3 elementor-widget elementor-widget-image\" data-id=\"c86a3b3\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"843\" height=\"466\" src=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-1024x566.png\" class=\"attachment-large size-large wp-image-1166\" alt=\"Preliminary Comparison STELLA and ASD\" srcset=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-1024x566.png 1024w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-300x166.png 300w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-768x424.png 768w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-1536x849.png 1536w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/PreliminaryComparisonSTELLAandASD-2048x1132.png 2048w\" sizes=\"(max-width: 843px) 100vw, 843px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-695b851 elementor-widget elementor-widget-text-editor\" data-id=\"695b851\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>In general, there is some correspondence between the ASD and Stella measurements, which is most pronounced for the dead\/residue and green grass.<\/li><li>There is also a significant variation in the data for corn, soybean and soil.<\/li><li>For the soil measurement the Stella variation appears to be consistently higher as compared to the ASD, which could be due to a difference in the sensor\/target\/sun measurement geometry.<\/li><li>For corn and soybean, the variation in the data appears relatively random, so it could be due to the variation in the 20 consecutive measurements we took. Perhaps, to reduce the variation will be best to calculate the means using the set of \u2018median\u2019 values?<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e026e1 elementor-widget elementor-widget-heading\" data-id=\"5e026e1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Comparison Field Reflectance Measurements of ASD Convolved to STELLA with STELLA\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-044dcc9 elementor-widget elementor-widget-image\" data-id=\"044dcc9\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"843\" height=\"258\" src=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-1024x314.png\" class=\"attachment-large size-large wp-image-1165\" alt=\"Comparing Field Reflectance\" srcset=\"https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-1024x314.png 1024w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-300x92.png 300w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-768x236.png 768w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-1536x472.png 1536w, https:\/\/science.gsfc.nasa.gov\/stella\/wp-content\/uploads\/2024\/01\/ComparingFieldReflectance-2048x629.png 2048w\" sizes=\"(max-width: 843px) 100vw, 843px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55a54e5 elementor-widget elementor-widget-text-editor\" data-id=\"55a54e5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>For all samples and ground covers the following reflectance bands compared well: 450, 500, 550, 570, 600, 650, 610, 680, 810 and 860 nm<\/li><li>The reflectance measurements collected from corn, soybean and grass with Stella at 730 nm and 760 nm were significantly higher as compared to the ASD reflectance convolved to Stella.<\/li><li>The differences in the observation geometry using ASD and Stella and the effects from the vegetation canopy heterogeneity are likely leading to the observed differences in the 730 nm and 760 nm bands.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d79ad0a elementor-widget elementor-widget-heading\" data-id=\"d79ad0a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Next Steps\u200b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-90b597d elementor-widget elementor-widget-text-editor\" data-id=\"90b597d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Use the \u2018median\u2019 values to calculate the means, or use the last 10 Stella measurements in the set of 20 (lower variation)<\/li><li>Compare Stella versus ASD vegetation indices (e.g., NDVI, SR, Clre, etc.)<\/li><li>Use the Stella band gains and response functions with the ASD data for direct ASD vs. Stella band comparison<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Field Comparison ASD and STELLA 8\/22\/2023 Preliminary Results Created by Dr. Petya Campbell, STELLA Lead Scientist Download STELLA Field Data 8\/22\/2023 XLSX ASD Reflectance Measurements\u200b&hellip;<\/p>\n","protected":false},"author":2,"featured_media":1157,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[73,7,25],"tags":[74,66,67],"class_list":["post-1154","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-field-studies","category-instruments","category-stella-1-1","tag-calibration","tag-nasa","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - 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