Achieving a stable blood oxygen level in patients who depend on this level of care is arguably determined in part by precise regulation of oxygen flow. The reliance on flow meter accuracy is the cautionary message that is relayed in the paper by Davidson et al in this issue of RESPIRATORY CARE.1 There is limited evidence that defends oxygen flow meter accuracy,2 which may account for the lack o...

To enable safe use of Synthetic Vision Systems at low altitudes, real-time range-to-terrain measurements may be required to ensure the integrity of terrain models stored in the system. This paper reviews and extends previous work describing the application of x-band radar to terrain model integrity monitoring. A method of terrain feature extraction and a transformation of the features to a comm...

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 ...

Active microwave radar satellites transmit and receive radar signals with wavelengths in the range of centimeters to one meter thus measuring the roughness of the sea surface, which enables the retrieval of wind and ocean wave fields. Synthetic Aperture Radars (SAR) are capable of imaging synoptic wind fields with a coverage of up to 500 km x 500 km and a resolution of down to 100 m. As the rad...

The Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) is one of the most complete and frequently used global-scale DEM products in various applications. However, previous studies have shown that the SRTM DEM is systematically higher than the actual land surface in vegetated mountain areas. The objective of this study is to propose a procedure to calibrate the SRTM DEM over l...

Digital elevation models (DEM) are indispensable elements of sensitive earth science studies. It is important the production and usage DEMs. The remote sensing offers scientists an source data on this subject. Radar data, which active system, has capacity in regard. DEM using InSAR been widely used literature last decade. temporal baseline parameter, factor generation from pairs, also affects f...

We compare two independent estimates of the rate of elevation change and geodetic mass balance of the Northern Patagonian Icefield (NPI) between 2000 (3,856 km2) and 2012 (3,740 km2) from space-borne data. The first is obtained by differencing the Shuttle Radar TopographyMission (SRTM) digital elevationmodel (DEM) from February 2000 and a Satellite pour l’Observation de la Terre 5 (SPOT5) DEM f...

Drainage basin/watershed analysis based on morphometric parameters has an essential role in watershed management and planning. Reliable delineation of watersheds drainage networks is critical for hydrological geomorphological studies. Since access to high-resolution digital elevation models (DEMs) surface (DSMs) costly, many researchers need evaluate low-resolution open-source products. Several...