The paper introduces the extraction of objects that are higher than their surroundings, like houses, trees, or bridges, by combining the results of a segmentation of a DTM and a texture analysis of the gray image. We propose a new algorithm (called dual rank) to extract the ground in the DTM, which can be seen as an extension of the gray opening. The extraction of trees in the gray image is don...

The successful operation of the WorldView-1 satellite has enabled advanced high-accuracy mapping using high-resolution satellite images, with or without the use of ground control points (GCPs). The stereo capability of the WorldView-1 sensor also provides the opportunity to extract high-resolution digital elevation models (DEMs). This article will examine the effectiveness of automatic DEM extr...

Automatically extracting object models from images is a complex task We describe research in extracting 3 0 models of buildings from aerial images. This work has resulted in several related systems including assisted extraction (minimal manual interaction to guide automatic processing). automatic extraction with limited imagery and limited building models, and automatic extraction with v e v go...

We present a novel level of detail selection method for real-time rendering, that works on hierarchies of discrete and continuous representations. We integrate smoothly represented, point rendered objects with discrete polygonal geometry and demonstrate our approach in a terrain flyover application. In this testing application the digital elevation model is augmented with forests in accordance ...

6 [1] The primary goal of the Ice, Cloud and land Elevation 7 Satellite (ICESat) mission is ice sheet elevation change 8 detection. Confirmation that ICESat is achieving its stated 9 scientific requirement of detecting spatially-averaged 10 changes as small as 1.5 cm/year requires continual 11 assessment of ICESat-derived elevations throughout the 12 mission. We use a GPS-derived digital elevat...

Routing is a common task when using digital maps, but most engines offer only travel routes for automobiles. However, a more interesting aspect in this topic arises when being a cyclist. For this target audience especially elevation information is relevant. Such data is available from different sources, but is not perfectly usable for cycling routing. Those digital elevation models may include ...

Three-dimensional (3-D) maps of the nearside and polar regions of the Moon can be obtained with an Earth-based radar interferometer. This paper describes the theoretical background, experimental setup, and processing techniques for a sequence of observations performed with the Goldstone Solar System Radar in 1997. These data provide radar imagery and digital elevation models of the polar areas ...

We use prior theory and experimental results to construct a quantitative relationship between soil moisture and the penetration depth of synthetic aperture radar (SAR) microwaves at L-, C-, and X-bands. This relationship is nonlinear and indicates that a change of 5% volumetric water content (VWC) can cause between 1 and 50 mm of change in C-band penetration depth depending on initial VWC. Beca...

Shoreline mapping and shoreline change detection are critical in many coastal zone applications. This paper presents results of the semi-automatic mapping of a coastal area of Lake Erie using 4-meter resolution multispectral (XS) and 1-meter resolution panchromatic (Pan) IKONOS Geo stereo images. An overview of the geometric processing of IKONOS imagery is presented. Then, the latest results of...

Geoscientists have become increasingly dependent on digital elevation models (DEMs) to delineate and measure landforms and landscapes. However, the DEM grid cell size available may not be the optimum resolution; this can mask subtle changes in measurements and lead to erroneous results. This paper presents a standardized statistical technique (i.e. statistical process control charts (SPCC)) for...