GEOID90: High‐resolution geoid height model for the conterminous United States

Milbert, Dennis

doi:10.1190/1.1822155

Cited by 12 publications

(15 citation statements)

References 4 publications

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“…(See, for instance, Pang and Nummedal, 1995;Bird, 1984. ) The plateau bears a similar relation to the regional geoidal high of the Western United States, which also has a local maximum in western Colorado (Milbert, 1991). Figure 6.…”

Section: Discussionmentioning

confidence: 70%

Laccolith complexes of southeastern Utah: Time of emplacement and tectonic setting — Workshop proceedings

Friedman¹,

Huffman²

1998

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Section: Discussionmentioning

confidence: 70%

Laccolith complexes of southeastern Utah: Time of emplacement and tectonic setting — Workshop proceedings

Friedman¹,

Huffman²

1998

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“…Thus a 5-min geoid is computed (Balde, 1994). The model is based on the calculation of Stokes formula, and the discrete-Fourier-transform approach is used, as described by Milbert (1991). In this approach, the combination of densified, terrain-corrected gravity and the higher- that span outside the local area and are well resolved in the global geoid can be reintroduced as the complementary background to the local model (Schwarz, Sideris, and Forsberg, 1990).…”

Section: Figure 7 Eomparison Of the New And Previous Data For A Bandmentioning

confidence: 99%

A GPS-Supported Gravity Survey in the Amazon of Ecuador

Balde¹,

Fishman²,

Aiken³

et al. 1999

GPS Solutions

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University el Texas at Dallas MAURIDIO f. DE LA FUEhlTE Beociencias Aplleaias SH, Mexico City, Mexico The growing importance and effectiveness of the Global Positioning System (GPS) in positioning geophysical surveys is now well established. In Ecuador's Amazon basin the use of GPS was the determining factor in the successful completion of a gravity survey carried out in 1994. Over 500 gravity stations, spaced from 1 to 5 km apart and positioned by GPS, were collected in the jungle environment in the country's southeast, where the preexisting data, of variable and unknown quality, were mostly confined to areas along the major rivers. This station densification, which includes the reoccupation of selected points, contributed to increase the gravity coverage; it also allowed us to evaluate and correct 1100 preexisting data points in the area, so that the different surveys can be merged. The composite data set is used for a geologic analysis of the study area, where previously unknown structures are discovered.

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“…The previous version of this 3-min geoid model, GEOID93 [Milbert, 1992], was investigated by Balde [1995] to determine its accuracy in north central Nevada when compared to a local 1-min geoid model. This was deemed necessary because in areas of rugged terrain, gravity station coverage, which forms the basis for computing geoid models, is biased toward the valleys.…”

Section: Survey Methodsmentioning

confidence: 99%

Quantitative characterization and elevation estimation of Lake Lahontan shoreline terraces from high‐resolution digital elevation models

Hare¹,

Ferguson²,

Aiken³

et al. 2001

J. Geophys. Res.

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Abstract. The precision with which the elevation of a feature, such as a terrace, can be measured depends on the characterization of the noise contaminating the measurement. A method for identification and extraction of terrace feature elevations is presented and the topographic noise, due to erosion, as well as measurement error, is quantified. Highresolution digital elevation models (DEM) are acquired at six wave-cut, volcanic bedrock terrace sites from around the highstand of paleo-Lake Lahontan in the western Great Basin. Local DEMs, which are tied to regional geodetic control, were acquired using conventional total station, rapid postprocessed and real-time kinematic Global Positioning System methods. The topographic signal is processed with derivative filters for geomorphic feature recognition and averaging for noise reduction. Results indicate that noise levels for identifiable features such as riser crest, knickpoint, and slope inflection point are statistically equivalent and on the order of 0.5 rn standard deviation. Averaging within topographic bins spanning -50 rn along terrace strike yields feature elevation estimates with standard errors on the order of 0.12 m. The mean bench window elevation (between the riser crest and knickpoint) has the lowest standard error and is systematically related to water level. Propagation of surveying, geoid estimation, and terrace feature elevation estimation errors indicates that displacements on the order of 0.5 rn may be resolved using these methods. Elevation estimate interpretation involves terrace development, degradation, and neotectonics, but this new methodology has significant advantages in studies of neotectonic or geomorphic processes using local terrace elevation measurements. IntroductionRecently, much scientific research has focused on the interaction of tectonic and geomorphic processes, [e.g., Merritts and Ellis, 1994] and has resulted in a recognition of the need for quantitative assessment of the formational, degradational, and tectonic processes which interact to produce observed landforms through time. As pointed out by Burke and Dixon [1988] and Dietrich et al. [1993], quantitative models for any of these processes are most sound when based on high-resolution topographic data. It is now possible to acquire topographic data The primary goal of this study is to develop and test a high-resolution method of making local terrace elevation estimates based on the geomorphology of remnant shoreline terraces. To this end, we have sampled topography from around the highstand shorelines of Pleistocene Lake Lahontan in western Nevada (Figure 1). These data provide the means for isolating coherent terrace features, which are related to the water level. The method developed here will have application to neotectonic and lithospheric flexure (isostatic rebound) studies which are based on analysis of vertical terrace deflections, as well as other applications where terrace geomorphology must be quantized at some local scale in order to study regional trends.Th...

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GEOID90: High‐resolution geoid height model for the conterminous United States

Cited by 12 publications

References 4 publications

Laccolith complexes of southeastern Utah: Time of emplacement and tectonic setting — Workshop proceedings

Laccolith complexes of southeastern Utah: Time of emplacement and tectonic setting — Workshop proceedings

A GPS-Supported Gravity Survey in the Amazon of Ecuador

Quantitative characterization and elevation estimation of Lake Lahontan shoreline terraces from high‐resolution digital elevation models

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