Identifying and Mapping Chinese Tallow Tree Using Unmanned Aerial Systems and...Sathishkumar Samiappan
Chinese tallow (Triadica sebifera) is a non-native species introduced to North America from China in the late 1700’s. In the early 1900s, the foreign plant introduction division of U.S department of agriculture encouraged planting tallow trees in gulf coast states to establish a local soap industry. Tallow trees mature in three years and can survive for 100’s of years. Mature trees can produce an average of 100,000 seeds annually. Tallow tree present a danger of expansion that can alter the ecosystems by outcompeting the native plant species and creating large monocultures. Chinese tallow is one of the most successful invaders of the coastal wetlands in southwestern Mississippi and southeastern Louisiana. It has the potential to invade surrounding marshes, changing them from herbaceous to woody plant communities. Management efforts targeting tallow trees rely heavily on accurately identifying and mapping the locations of tallow trees. It is laborious and impractical to map tallow trees by walking from tree to tree with a GPS unit, using satellite imagery, or through aerial photography from manned aircraft. We utilized an unmanned aerial system (UAS) capable of collecting geo-referenced high spatial resolution imagery. This system negates the low resolution and long update times of satellite imagery, and the hazards of on-the-ground fieldwork. We collected 5-band multispectral imagery (red, green, blue, red edge and near infra-red) using a UAS with multispectral payload flown at an altitude of 400 feet. Pixel size was 2.5 inches. Images were then mosaicked to form an orthomosaic. A digital surface model (DSM) was derived from the collected imagery to estimate the heights of the various plants on the ground. Support Vector Machines classification using the multispectral bands and the normalized DSM is used to identify and map tallow trees. Experiments show over 90% agreement between tallow identified from multispectral imagery and ground truth data.
Identifying and Mapping Chinese Tallow Tree Using Unmanned Aerial Systems and...Sathishkumar Samiappan
Chinese tallow (Triadica sebifera) is a non-native species introduced to North America from China in the late 1700’s. In the early 1900s, the foreign plant introduction division of U.S department of agriculture encouraged planting tallow trees in gulf coast states to establish a local soap industry. Tallow trees mature in three years and can survive for 100’s of years. Mature trees can produce an average of 100,000 seeds annually. Tallow tree present a danger of expansion that can alter the ecosystems by outcompeting the native plant species and creating large monocultures. Chinese tallow is one of the most successful invaders of the coastal wetlands in southwestern Mississippi and southeastern Louisiana. It has the potential to invade surrounding marshes, changing them from herbaceous to woody plant communities. Management efforts targeting tallow trees rely heavily on accurately identifying and mapping the locations of tallow trees. It is laborious and impractical to map tallow trees by walking from tree to tree with a GPS unit, using satellite imagery, or through aerial photography from manned aircraft. We utilized an unmanned aerial system (UAS) capable of collecting geo-referenced high spatial resolution imagery. This system negates the low resolution and long update times of satellite imagery, and the hazards of on-the-ground fieldwork. We collected 5-band multispectral imagery (red, green, blue, red edge and near infra-red) using a UAS with multispectral payload flown at an altitude of 400 feet. Pixel size was 2.5 inches. Images were then mosaicked to form an orthomosaic. A digital surface model (DSM) was derived from the collected imagery to estimate the heights of the various plants on the ground. Support Vector Machines classification using the multispectral bands and the normalized DSM is used to identify and map tallow trees. Experiments show over 90% agreement between tallow identified from multispectral imagery and ground truth data.
1. ARTICULO
Reportan casos de intoxicación tras derrame de ácido sulfúrico
AGUA PRIETA, SON.- Vecinos de la ciudad de Naco, han manifestado
síntomas de algunas enfermedades respiratorias como consecuencia del
derrame de ácido sulfúrico, ocurrido el pasado 6 de agosto por el
descarrilamiento de un tren.
El caso más grave se registró este domingo, cuando un policía municipal de
Naco y residente del ejido Cuauhtémoc, fue atendido de urgencia por el doctor
Sergio Rivera.
El agente de policía de Naco fue atendido de una enfermedad llamada
neumonitis tóxica aguda y se teme que vayan a surgir más casos, según
comentó personal médico de manera extraoficial.
Se desconoce la cantidad oficial del número de afectados. Personal del Seguro
Social ha recomendado la evacuación inmediata ejido Cuauhtémoc donde
ocurrió el derrame de 160 mil litros de ácido sulfúrico.
COMENTARIO
El derrame de ácido sulfúrico producido por el descarrilamiento de un tren
trajo víctimas humanas y quien no quita también que se produzca en un
tiempo efectos en el suelo donde ocurrió ya que también se vio afectado el
agua de la zona en México. Los malestares que las victimas presentaron
fueron de tipo respiratorias lo cual puede traer consecuenicas mas graves
después de un gran tiempo.
WEBGRAFIA
http://www.expreso.com.mx/seguridad/nogales/65993-reportan-casos-de-
intoxicacion-tras-derrame-de-acido-sulfurico.html