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Estimation with Weak Instruments: Accuracy of Higher Order Bias and MSE Approximations
weak instruments higher order expansions
2015/9/22
In this paper we consider parameter estimation in a linear simultaneous equations model. It
is well known that two stage least squares (2SLS) estimators may perform poorly when the
instruments are w...
HEIGHT ACCURACY BASED ON DIFFERENT RTK GPS METHOD FOR ULTRALIGHT AIRCRAFT IMAGES
Aerial images positioning image processing accuracy
2015/9/21
Height accuracy is one of the important elements in surveying work especially for control point’s establishment which requires an accurate measurement. There are many methods can be used to acquire he...
ACCURACY OF DIGITAL FRAME CAMERAS
digital aerial cameras geometry model deformation stereo plotting
2015/9/17
Due to legal restrictions, the German hard coal mining company Deutsche Steinkohle AG (DSK) is obliged to conduct a monitoring on surface changes (subsidence) caused by mining activity (e.g. Topograph...
ASSESSMENT OF DSM ACCURACY OBTAINED BY HIGH RESOLUTION STEREO IMAGES
IKONOS Cartosat DSM accuracy assessment
2015/9/17
The high-resolution satellite systems are more and more commonly providing products obtained in a stereoscopic models. This type of stereoscopic images, usually obtained from a single orbit becomes wi...
STEREOSCOPIC ACCURACY
Accuracy Camera Comparison Pixel Precision Quality Statistics Stereoscopic
2015/9/17
In the generation of photogrammetric products with large terrain coverage (Orthophoto, DTMs) some crucial issues like the application of DG / ISO procedures, the management of high amounts of data or ...
The accuracy of a DEM derived from ASTER data using differential GPS measurements
ASTER DEM GCPs RMSE Accuracy Assessment
2015/9/17
ASTER is a high-spatial resolution, multispectral imaging system flying aboard TERRA, a satellite launched in December 1999 as part of NASA’s Earth Observing System (EOS). An ASTER scene covering 61.5...
Accuracy assessment of modeling architectural structures and details using terrestrial laser scanning
Laser Scanning 3D model Accuracy
2015/9/11
One of the most important aspects when performing architectural documentation of cultural heritage structures is the accuracy of
both the data and the products which are generated from these data: do...
ACCURACY ASSESSMENT IN STRUCTURE FROM MOTION 3D RECONSTRUCTION FROM UAV-BORN IMAGES:THE INFLUENCE OF THE DATA PROCESSING METHODS
3D Surveying Low cost UAV Laser Scanner Structure from Motion Accuracy
2015/9/10
The evolution of Structure from Motion (SfM) techniques and their integration with the established procedures of classic stereoscopic photogrammetric survey have provided a very effective tool for the...
DIRECT GEOREFERENCING ON SMALL UNMANNED AERIAL PLATFORMS FOR IMPROVED RELIABILITY AND ACCURACY OF MAPPING WITHOUT THE NEED FOR GROUND CONTROL POINTS
Unmanned Aerial Vehicle UAV Direct Georeferencing GNSS Inertial Mapping Photogrammetry
2015/9/10
This paper presents results from a Direct Mapping Solution (DMS) comprised of an Applanix APX-15 UAV GNSS-Inertial system integrated with a Sony a7R camera to produce highly accurate ortho-rectified i...
THE ROLE OF IMAGE PROPERTIES IN DETERMINING CHANGE DETECTION ACCURACY
Quantitative land change analysis
2015/9/9
There have been a large number of studies comparing land use/cover change detection methods. The
results of these studies tend to be contradictory, and consequently no clear consensus on the optimal
...
Mobile mapping technologies have become increasingly interesting in the context of
land surveying. As opposed to traditional surveying techniques, the data acquisition is
clearly separated of the me...
performance analysis of altm3100ea system:instrument specifications and accuracy of lidar data
LiDAR laser scanning DEM/DTM accuracy performance
2015/9/1
Over the last decade the number of airborne lidar systems currently deployed and operating in the field has grown impressively.This growth has intensified the level of competition among lidar equipmen...
accuracy comparison tests on ortho-rectified high resolution satellite images
Comparison Accuracy High resolution IKONOS Georeferencing Geometric Modelling
2015/9/1
The aim of this paper is to study the impact of using various models for the determination of orientation parameters or georeferencing of high resolution satellite images, on the accuracy of the extra...
in-depth investigations of parameters influencing accuracy of orthoimages from high resolution satellites
Orthoimages Accuracy analysis High spatial resolution satellites
2015/9/1
Orthoimages are the most popular product from high spatial resolution satellite sensors. Various investigations, especially regarding Ikonos and Quickbird, have been published and achieved accuracies ...
A simulation study for the geometric accuracy testing of airborne linear array ccd cameras
geometric accuracy testing airborne linear array ccd cameras
2015/9/1
Since their first introduction, linear array CCD cameras play an important role in the airborne optical digital sensors market, together with matrix array CCD sensors. The methods and algor ithms to p...