FN Archimer Export Format PT J TI Validation of Envisat Rain Detection and Rain Rate Estimates by Comparing With TRMM Data BT AF TRAN, N TOURNADRE, Jean FEMENIAS, P AS 1:1;2:2;3:3; FF 1:;2:PDG-DOP-DCB-OPS-LOS;3:; C1 CLS, Space Oceanog Div, F-31520 Ramonville St Agne, France. IFREMER, Technopole Brest Iroise, F-29280 Plouzane, France. European Space Agcy, European Space Res Inst Earth Observat ESRIN, I-00044 Frascati, Italy. C2 CLS, FRANCE IFREMER, FRANCE ESA, ITALY SI BREST SE PDG-DOP-DCB-OPS-LOS IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe IF 1.832 TC 4 UR https://archimer.ifremer.fr/doc/2008/publication-4719.pdf LA English DT Article DE ;remote sensing;rain;radar cross sections;Altimetry AB This letter provides validation results on both Envisat altimeter rain detection flag and rain rate estimates. This assessment was performed based on 18-month collocated data sets between Envisat with two sensor measurements from the Tropical Rainfall Measuring Mission, i.e., the microwave imager and the precipitation radar. Along with the comparison between closest sensor measurements with strict spatial and temporal criteria, discussion is also provided on environmental context insight when interpreting comparison results based on collocated data. PY 2008 PD OCT SO Geoscience and Remote Sensing Letters SN 1545-598X PU IEEE VL 5 IS 4 UT 000260956600022 BP 658 EP 662 DI 10.1109/LGRS.2008.2002043 ID 4719 ER EF