Search results for ":FORESTRY"
showing 10 items of 65 documents
Kartoppelu dahrs : Ko tapehz, lai mihļi Widsemmes latweeschi ne wairs us preekschu gruhtu baddu zeesch, weens no wiņņu ustizzameem dsihwes beedreem s…
1790
Padoma dewejs pee lauku un pļawu mehsloschanas [Padoma devējs pie lauku un pļavu mēslošanas]
1874
Eda ǝlǝ terudu bǝjumǝciwkǝ
1933
Apskats par medībām Sibīrijā. Teksts evenku valodā.
Forest Road Planning, Construction and Maintenance to Improve Forest Fire Fighting: a Review
2019
Forest roads play a key-role in fire fighting activities. In fact, all ground-based activities are strictly related to the presence of forest roads as access to fire edge. In spite of this important role, forest roads are often planned and built without considering their use in fire fighting, and this also occurs in literature, where few studies are dedicated to the importance of forest roads in fire fighting. A well-developed and well-maintained forest road network is the answer to different needs in fire management. The objective of this review is to clarify basic principles for obtaining efficient road network also for fire fighting, collecting, defining and resuming the main roles, the …
Die landwirthschaftlich-chemische Versuchsstation am Polytechnikum zu Riga, Lief. I
1875
Bericht über die Thätigkeit in den Jahren 1872/73 und 1873/74
Laukkopība
1939
Saturs (nodaļas): Priekšvārdi. Laukkopības būtība un laukkopības zinātnes uzdevumi. I. Augu augšanas faktori un to kārtošana laukā. I I . Augsnas auglība un ražība. III. Nezāles un to apkarošana. IV. Augsnas strādāšana. V. Lauku iedalīšana. VI. Eksperimentālā laukkopība (lauku izmēģinājumi). Literatūra. Lietu saraksts.
Отчетъ о второй Прибалтійской центральной выставкѣ сельскаго хозяйства 1871 года въ Ригѣ: съ указаніемъ на характеристическія особенности и потребнос…
1871
Augkopība: saīsināts kurss
1926
Uz grāmatas vāka norādīts atšķirīgs izdošanas gads 1927. Tekstu ilustrē 78 zīmējumi.
Hyperspectral UAV-Imagery and photogrammetric canopy height model in estimating forest stand variables
2017
Remote sensing using unmanned aerial vehicle (UAV) -borne sensors is currently a highly interesting approach for the estimation of forest characteristics. 3D remote sensing data from airborne laser scanning or digital stereo photogrammetry enable highly accurate estimation of forest variables related to the volume of growing stock and dimension of the trees, whereas recognition of tree species dominance and proportion of different tree species has been a major complication in remote sensing-based estimation of stand variables. In this study the use of UAV-borne hyperspectral imagery was examined in combination with a high-resolution photogrammetric canopy height model in estimating forest v…
Unmanned aerial system imagery and photogrammetric canopy height data in area-based estimation of forest variables
2015
In this paper we examine the feasibility of data from unmanned aerial vehicle (UAV)-borne aerial imagery in stand-level forest inventory. As airborne sensor platforms, UAVs offer advantages cost and flexibility over traditional manned aircraft in forest remote sensing applications in small areas, but they lack range and endurance in larger areas. On the other hand, advances in the processing of digital stereo photography make it possible to produce three-dimensional (3D) forest canopy data on the basis of images acquired using simple lightweight digital camera sensors. In this study, an aerial image orthomosaic and 3D photogrammetric canopy height data were derived from the images acquired …