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Manipulación De Productos Geonetcast-Americas Utilizando El Software Ilwis

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Manipulación De Productos Geonetcast-Americas Utilizando El Software Ilwis MANIPULACIÓN DE PRODUCTOS GEONETCAST-AMERICAS UTILIZANDO EL SOFTWARE ILWIS Diego Souza INPE - Instituto Nacional de Pesquisas Espaciais CPTEC - Centro de Previsão de Tempo e Estudos Climáticos DSA - Divisão de Satélites e Sistemas Ambientais Cachoeira Paulista, São Paulo, Brasil Marzo de 2016 Con la colaboración de: Simone Sievert (INPE/DSA/CPTEC) Renato Galante (INPE/DSA/CPTEC) Esta obra está licenciada bajo la Licencia Creative Commons Atribución-NoComercial 3.0 Unported. Esta obra foi licenciada sob uma Licença Creative Commons Atribuição-NãoComercial 3.0 Não Adaptada. This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. v 1.0.0 Manipulación de Productos GEONETCast-Americas utilizando el software ILWIS ÍNDICE DE CONTENIDOS 1 INTRODUCCIÓN........................................................................................................... 3 1.1 El software ILWIS ......................................................................................................................... 3 1.2 Descarga e instalación del software .......................................................................................... 3 2 MANIPULANDO LOS GEOTIFFS DEL SATÉLITE GOES-13 ..................................... 5 2.1 Preparando el entorno de trabajo .............................................................................................. 5 2.2 Ventana principal del software ILWIS y la carpeta de trabajo ............................................... 5 2.3 Importando la primera imagen GeoTIFF ................................................................................... 6 2.4 Abriendo un archivo raster y modificando la paleta de colores ............................................. 8 2.5 Visualizando el valor de la variable física de cada pixel ....................................................... 10 2.6 La herramienta Map Calculation............................................................................................... 11 2.7 Añadiendo un mapa (“Basemap”) en la visualización ........................................................... 16 2.8 Configurando el mapa añadido ................................................................................................ 17 2.9 Añadiendo bordes de latitud y longitud y una grilla de referencia ...................................... 18 2.10 Herramientas de “Zoom” y “Panning” ...................................................................................... 19 2.11 Añadiendo una leyenda en la ventana de visualización ....................................................... 21 2.12 Creando una nueva paleta de colores usando la herramienta “Slicing” ............................ 29 3 MANIPULANDO LOS DATOS HRIT DEL SATELITE METEOSAT-10 ...................... 39 3.1 Preparando el entorno de trabajo ............................................................................................ 39 3.2 Instalación básica del “GEONETCast-Toolbox” ..................................................................... 39 3.3 Convirtiendo los datos HRIT para el formato raster de ILWIS ............................................ 41 3.4 Manipulaciones básicas con las imágenes MSG .................................................................. 43 3.5 Añadiendo diversas imágenes en la misma ventana de visualización .............................. 50 3.6 Calculando el Índice de Vegetación por Diferencia Normalizada (NDVI) .......................... 58 3.7 Utilizando instrucciones condicionales en ILWIS .................................................................. 65 3.8 Creando composiciones RGB’s usando scripts en ILWIS ................................................... 69 4 CONCLUSION ............................................................................................................ 81 5 GLOSÁRIO ................................................................................................................. 82 6 REFERENCIAS BIBLIOGRÁFICAS ........................................................................... 83 APÉNDICE A CONTROL DE VERSIONES .................................................................... 84 APÉNDICE B NOTAS DEL USUÁRIO ........................................................................... 85 Página 2 de 87 Manipulación de Productos GEONETCast-Americas utilizando el software ILWIS 1 INTRODUCCIÓN El objetivo de este tutorial es ejemplificar la manipulación de datos recibidos por el sistema GEONETCast-Americas utilizando la herramienta libre ILWIS. Siguiendo los procedimientos mostrados en el tutorial, el usuario GEONETCast-Americas estará capacitado a hacer manipulaciones básicas para el desarrollo de sus propias analices. Es muy importante resaltar que los procedimientos vistos en este tutorial no se aplican solamente a los datos transmitidos en GEONETCast-Americas, sino que a cualquier conjunto de datos que tengan los mismos formatos vistos en el tutorial (GeoTIFF, MSG HRIT y SHAPEFILE). 1.1 El software ILWIS La sigla ILWIS significa Integrated Land and Water Information Systems (Sistema de Informaciones Integrado para Tierra y Agua). De acuerdo con [1], es un Sistema de Informaciones Geográficas (GIS) y un programa para aplicaciones de detección remota para el procesamiento de datos raster y vectoriales. El software ILWIS fue inicialmente distribuido y desarrollado por ITC Enschede (International Institute for Geo-Information Science and Earth Observation) de Holanda para el uso de sus investigadores y estudiantes. Desde 1 de julio de 2007, fue lanzado como un software libre sobre los términos de la “GNU General Public License”. Siendo utilizado por más de dos décadas por muchos estudiantes, profesores e investigadores, el software ILWIS es una de las herramientas más amigables para el manoseo de datos raster y vectoriales actualmente disponibles. Ese fue el motivo por lo que este software fue elegido para el desarrollo de este tutorial. Es muy fácil aprenderlo en comparación a otros softwares. En este tutorial vamos a aprender cómo convertir imágenes para el formato acepto por ILWIS, como cambiar la paleta de colores, como crear paletas de colores personalizadas, realizar operaciones matemáticas en una imagen y entre más imágenes, como añadir mapas a la visualización, añadir bordes de latitud y longitud, grillas de referencia y leyendas. El primer paso es la instalación del software. 1.2 Descarga e instalación del software Descargue el software ILWIS en el siguiente enlace directo: http://52north.org/downloads/send/124-ilwis-30803/401-n52ilwisv30803 Página 3 de 87 Manipulación de Productos GEONETCast-Americas utilizando el software ILWIS La figura 1 muestra la página para la descarga del software, encontrada en: http://52north.org/downloads/category/124-ilwis-30803 Fig. 1: Página de descarga del software ILWIS Extraiga el archivo ejecutable “setup.exe” en su directorio local. Siga el procedimiento estándar de instalación en Windows. Al instalarlo usando las opciones estándar, el programa estará localizado en “C:\Program Files (x86)\n52\ILWIS38”. Puedes elegir el directorio de su preferencia. Info.: Si eres un usuario Linux, el software ILWIS funciona en Linux bajo el software WINE. Acceda el siguiente enlace para mayores informaciones: http://www.ilwis.org/ilwis_in_linux.htm Página 4 de 87 Manipulación de Productos GEONETCast-Americas utilizando el software ILWIS 2 MANIPULANDO LOS GEOTIFFS DEL SATÉLITE GOES-13 Los primeros archivos que vamos a manipular están en el formato GeoTIFF y se refieren a los sectores “Northern Hemisphere Extended” y “Southern Hemisphere” del satélite GOES-13. 2.1 Preparando el entorno de trabajo Descargue las muestras en el formato GeoTIFF utilizadas en esta primera parte del tutorial (archivos generados por NOAA-NESDIS “goeseastnh04i40971645.tif.tif”, “goeseastnh04i30971645.tif”, “goeseastnh01v0971645.tif” y archivos generados por el INPE “INPE_SAI_201408051300.tif” y “INPE_SAW_201408051300.tif”) en el siguiente enlace: https://www.dropbox.com/sh/zknqzcfpper4jru/AACrLVWRndDwiWNGt-Xv5Di0a?dl=0 En este procedimiento, los archivos GeoTIFF se salvaron en la carpeta "C:\VLAB" (evitar el uso de espacios en los nombres de las carpetas en este tutorial). Nos referiremos a esta carpeta como “carpeta de trabajo” en este tutorial. Info.: Las imágenes como las utilizadas en este tutorial pueden ser recibidas en tiempo casi real a través del sistema GEONETCast-Americas y se localizan en la carpeta “KenCast\Fazzt\incoming\” en su estación de recepción. Descargue las tablas de colores en el siguiente enlace: https://www.dropbox.com/s/4sd6eoaqby8rqe5/Color_Tables.zip?raw=1 Extraiga en archivo “Color_Tables.zip” en la carpeta “system” de ILWIS. Si en la instalación del softwares elegiste la carpeta estándar, la carpeta “system” estará localizada en “C:\Program Files (x86)\n52\ILWIS38\system”. 2.2 Ventana principal del software ILWIS y la carpeta de trabajo Abra el software ILWIS y seleccione la carpeta de trabajo (“C\VLAB”). Puedes encontrarla utilizando el navegador de la ventana principal, o usando la barra de herramientas en la parte superior de la ventana, haciendo clic en el icono [New Catalog] y buscando la carpeta deseada. Al encontrar la carpeta de trabajo, las imágenes no serán mostradas, pues todavía no las importados al formato acepto por ILWIS (ILIWS Raster). La figura 2 muestra la ventana principal del software, donde podemos ver la carpeta de trabajo, la lista de operaciones y la interfaz de línea de comando. Página 5 de 87 Manipulación de Productos GEONETCast-Americas
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