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Drought Frequency Characterization in Spain by Means of T Analysis
Published in Saeid Eslamian, Faezeh Eslamian, Handbook of Drought and Water Scarcity, 2017
Javier Álvarez-Rodríguez, Luis Miguel Barranco
Rainfall and runoff are periodically assessed in Spain for water resources planning as well as recharging aquifers [6,17]. For this purpose, a water-budget model was developed in SIMPA to simulate an unaltered (i.e., natural) hydrologic regime. SIMPA is a Spanish acronym meaning “Integrated System for Rainfall-Runoff Modeling.” It comprises several tools to analyze spatial and temporal hydrological variables and to simulate several hydrological processes. It was implemented in the Center for Hydrographic Studies of CEDEX [3]. Its spatial database is the Geographic Information System GRASS-GIS (GRASS Development Team, 2015 [12]). The hydrological cycle is conceptualized by means of soil and aquifer storages as well as different laws to estimate water transfers between them [8,21,23,26]. Hydrological variables simulated are rainfall, PET and actual evapotranspiration (AET), soil water content, recharge, direct runoff, and groundwater runoff.
Principal polar spectral indices for mapping mangroves forest in South East Asia: study case Indonesia
Published in International Journal of Digital Earth, 2019
Fatwa Ramdani, Sabaruddin Rahman, Chandra Giri
The methodology used in this study is summarized in Figure 3. Grass GIS and QGIS open source software was used to generate the PPS indices. The Grass GIS was employed for pre-processing the Landsat images and for the Principal Component Analysis (PCA). The result then exported to GeoTIFF format and processed in QGIS environment for PPS indices transformation, NDVI calculation, and RGB band composite. For the accuracy and precision measurement, the result of fieldwork then imported to QGIS for post-processing analysis. The specification for computing platform used in this study is as following: Processor: Intel ®Pentium Core i7-3612QM, CPU @ 2.10GHzRAM: 8.00 GBSSD: 500GBOperating System: Windows 10, 64-bit Operating System, x64-based processorVGA Card: NVIDIA GEFORCE® with CUDA™