Nasas technology transfer program has created an online resource to promote commercial use of this data and the software tools needed to work with it. For the first time, sun glint requirement for detecting oil films in optical remote sensing imagery from the three widely used ocean color sensors is quantified through multisensor comparisons, with the following two main findings. Groetsch 2, 3 1 dlr, remote sensing technology institute, oberpfaffenhofen, d82234 wessling, germany. A spectral model for correcting sun glint and sky glint. With the remote sensing toolkit, users will now be able to find, analyze and utilize the most relevant data for their research, business projects or conservation efforts. The main reason to perform this test was the application of this methodology to photogrammetric and remote sensing applications. How much benthic information can be retrieved with.
This lesson uses the modified approach of hedley et al. When water surface is not flat, the direct radiance originating from the sun can be reflected on the crests or slopes of waves. Detection of natural oil seeps in the atlantic ocean using modis. Remote sensing is more about processing and interpreting images based on the different spectral or thermal data stored in the image. Remote sensing is more or less a subset of the umbrella term gis. Dinnat goddard earth science and technology center university of maryland baltimore county nasa goddard space flight center greenbelt, md 2077 1 abstractthe aquariuslsacd mission will employ three l band 1. That gleam is caused by sunglint, an optical phenomenon that occurs when sunlight reflects off the surface of water at the same angle that a satellite sensor views it. The sun zenith angle and sun azimuth can be calculated by longitude, latitude, and time. In the past, remote sensing has been used to detect oil seeps in the gulf of mexico and off of the coast of southern california. Ive looked through my library and online, but most things are just reading. Use of airborne imagers is often the most cost effective method to map water quality in lakes and geomorphologically complex coastal waters where satellite sensors cannot provide adequate spatial andor spectral resolution.
On optimal imaging angles in multiangle ocean sun glitter. Gis and remote sensing software unspider knowledge portal. In particular, a near infrared orthophoto and normalized digital vegetation index. With customized transmit protocol that is registered as an intellectual property and sslaes 256bits data encryption, efficiency and security are both guaranteed throughout your usage. The result is a mirrorlike specular reflection of sunlight off the water and back at the satellite sensor or astronaut. Pdf removing sun glint from optical remote sensing. Supported ios and android platform, offers you more convenient ways to file sharing. Multispectral remote sensing is often considered for.
Gis and remote sensing software software type any crowdsourcingvgi databaselibrary desktop gis desktop image processing remote sensing software raster data extension toolconverter web gis display only web processing cloud computing. A sun glint correction method for hyperspectral imagery. However, airborne remote sensing can be seriously impeded by the effect of waveinduced sun glint. Enjoy a beautiful panoramic image of the sun glinting over the atlantic ocean. Removing sun glint from optical remote sensing images of. Because multiple imaging times of multiangle sg remote sensing are close, we believe that the angles associated with the sun have not changed, but sva and sensor azimuth are significantly different. The sun glint problem is produced especially in a windroughened surface of water. A spectral model for correcting sun glint and sky glint p. It enables wasi2d to correct the wavelength dependent reflections of the sun disk and the sky at the water surface sun glint, sky glint, and it allows to process, besides reflectance, also upwelling radiance data. Although sun glint is ubiquitous in fluvial remote sensing imagery, riverspecific. For many years, the orientation and the extent of sun glint, as seen with visible imagery, has been used to locate regions of smooth seas and weak surface winds. The capability for mapping two species of seagrass, thalassia testudinium and syringodium filiforme, by remote sensing using a physics based model inversion method was investigated. Predicting species cover of marine macrophyte and invertebrate species combining hyperspectral remote sensing, machine learning and regression techniques. Remote sensing method was far less sensitive to the.
Removing sun glint from optical remote sensing images of shallow rivers. Sun glint, caused by specular reflection of solar radiation on nonflat water surfaces, can be a serious confounding factor for remote sensing of benthic habitats, especially in images with a spatial resolution of title. Radiometric correction of landsat imagerysun elevation. Sun glint correction algorithms were tested on a hyperspectral image containing crosstrack sun glint. For instance, if the surface winds are calm and the water surface is smooth, reflection is strong when the sunsatellite geometry is optimized. While bomber is based entirely on a model of remote sensing reflectance, wasi2d includes also a model of downwelling irradiance. The theme is accompanied by an ambient electronic track by chris zabriskie. Applying a deglint method using idl geonet, the esri. Frontiers remote sensing of seagrass leaf area index and. Sun glints and landsat 8 surface reflectance product. The model included uncertainty propagation based on variation. Evaluation of sun glint correction algorithms for highspatial resolution hyperspectral imagery chad i. Sun glint correction of high and low spatial resolution images of aquatic scenes. This method effectively removed effects of sun glint, thin clouds and fog, and the spectrally.
Typically, sun glint forms bands of white along wave edges on the windward side of near shore environments figure 5. Application of the hyperspectral imager for the coastal ocean to phytoplankton ecology studies in monterey bay, ca, usa. Using sun glint to check the relative calibration of. Does anyone know some good textbooks with activitiesexercises that teach remote sensing.
Sun glint, caused by specular reflection of solar radiation on nonflat water surfaces, can be a serious confounding factor for remote sensing of benthic habitats, especially in images with a. For reference, im using arcgis pro, but am open to learning within another software just not arcmap. Thus, the objective of this study is to determine the sun glint threshold required for detecting thin oil. Nasa earth observatory 20, february 25 northeastern usa coastline in sunglint. A python package geemap for interactive mapping with. Sun glint and sea surface salinity remote sensing emmanuel p. The image is a hiresolution panoramic at 4096x64 pixels. Sun glint requirement for the remote detection of surface. This paper proposes an automatic approach for detecting sun reflections problems hotspot and sun glint in multispectral images acquired with an unmanned aerial vehicle uav, based on a photogrammetric strategy included in a flight planning and control software developed by the authors. The bilko 3 image processing software familiarity with bilko 3 is required to carry out this lesson. Sunlogin is a free remote control application that supports remote poweron, remote desktop and nat traversal. Imagery was acquired at an approximately 169 square feet 16 square meters spatial resolution on july 14, 15, and 30, 1996. Figure 1 illustrates the methods used to observe oceanic regions that contain sun glint and to assess the relative accuracy of the reflected radiances at different wavelengths.
Layout of the developed software, mflipv2, for hotspot and sun glint detection in uav flights. Sun glint is the specular reflection of light from the water surface, which often causes unusually bright pixel values that can dominate fluvial remote sensing imagery and obscure the waterleaving radiance signal of interest for mapping bathymetry, bottom type, or water column optical characteristics. Evaluation of sun glint correction algorithms for high. The dark background region is the cloudfree ocean region away. Application of the hyperspectral imager for the coastal. Remote sensing reflectance was determined using the surface. I using lyzenga algorithm to correct sunglint in rgbnir images taken using dmc camera and the results were impressive. This is a tutorial on some image preprocessing task and image classification using erdas imagine 2011. This is achieved through comparing sameday usually within 12h imagery of multiple sensors over the same natural seeps. Sunlogin remote controlremote desktop,remote control. The model was based on a threedimensional canopy model combined with a model for the overlying water column. Sun glint is the specular reflection of light from the water surface, which often causes unusually bright pixel values that can dominate fluvial remote sensing imagery and obscure the water. Spatial profiles of pixel radiance by pixel position were compared and slope values were calculated. Using systems such as arcgispro or arcmap will have you creating thematic maps to help people, or yourself, understand the data more spatially.
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