chart datum

简明释义

海图基准面

英英释义

例句

1.The depth of the water is measured from the chart datum to ensure accurate navigation.

水深是从图表基准测量的，以确保航行的准确性。

2.Surveys are often conducted relative to the chart datum to ensure consistency in measurements.

调查通常是相对于图表基准进行的，以确保测量的一致性。

3.When planning the construction of a dock, engineers must consider the chart datum for tidal variations.

在规划码头建设时，工程师必须考虑潮汐变化的图表基准。

4.Boaters should always check the chart datum before heading out to avoid running aground.

船员在出海前应始终检查图表基准以避免搁浅。

5.The chart datum used in this region is based on the lowest astronomical tide.

该地区使用的图表基准是基于最低天文潮。

作文

In the field of navigation and cartography, the term chart datum refers to a specific reference point or baseline used to measure water depths and elevations. It serves as a crucial foundation for nautical charts and topographic maps, allowing sailors and land navigators to accurately interpret the data presented to them. Understanding the concept of chart datum is essential for anyone involved in maritime activities or geographic studies, as it ensures safety and precision during navigation.The significance of chart datum cannot be overstated. For instance, when a sailor looks at a nautical chart, they rely on the chart datum to determine how deep the water is at various points. This information is vital for avoiding underwater hazards such as rocks, reefs, or wrecks that could pose a danger to the vessel. If the chart datum is not well understood or misinterpreted, it could lead to catastrophic outcomes, including grounding or capsizing.One common example of chart datum is the Mean Sea Level (MSL), which is often used as a reference point for measuring tides and water depths. MSL is calculated based on long-term observations of sea levels, providing a stable and reliable baseline for navigators. However, it is important to note that chart datum can vary depending on the region and local conditions. Different areas may use different reference points, which can lead to variations in water depth readings. This variability necessitates that navigators are familiar with the specific chart datum used in the waters they are navigating.Furthermore, the use of chart datum is not limited to nautical charts; it also extends to land surveys and topographic maps. Engineers, architects, and land planners utilize chart datum to ensure that their projects are built to the correct specifications and elevations. For instance, when constructing a building or infrastructure, professionals must consider the chart datum to avoid flooding and ensure proper drainage. Inaccurate elevation measurements can lead to serious structural issues and increased costs.As technology continues to advance, the methods of determining and using chart datum are also evolving. With the advent of GPS and satellite technology, navigators now have access to more precise data than ever before. These advancements allow for real-time updates and adjustments to chart datum, enhancing safety and efficiency in navigation. However, it remains imperative that users understand the underlying principles of chart datum to make informed decisions based on the data provided.In conclusion, the concept of chart datum is integral to navigation and cartography, serving as a foundational reference for measuring water depths and elevations. Its importance spans across various fields, from maritime navigation to land surveying, highlighting the need for accurate and reliable data. As technology progresses, the understanding and application of chart datum will continue to evolve, but its fundamental role in ensuring safety and precision in navigation will remain constant. Therefore, it is essential for anyone involved in these fields to grasp the significance of chart datum and its implications for their work.

在航海和制图领域，术语chart datum指的是用于测量水深和高程的特定参考点或基准线。它作为海图和地形图的重要基础，使水手和陆地导航员能够准确解读呈现给他们的数据。理解chart datum的概念对于任何参与海洋活动或地理研究的人来说都是至关重要的，因为它确保了导航过程中的安全性和精确性。chart datum的重要性不容小觑。例如，当水手查看海图时，他们依赖于chart datum来确定各个点的水深。这些信息对于避免潜在的水下危险，如岩石、暗礁或沉船等，对船只构成威胁至关重要。如果对chart datum的理解不当或误解，可能导致灾难性的后果，包括搁浅或倾覆。一个常见的chart datum示例是平均海平面（MSL），通常用作测量潮汐和水深的参考点。MSL是根据长期的海平面观察数据计算得出的，提供了一个稳定可靠的导航基准。然而，需要注意的是，chart datum可能因地区和当地条件而异。不同地区可能使用不同的参考点，这可能导致水深读数的差异。这种变异性要求导航员熟悉他们所导航水域中使用的特定chart datum。此外，chart datum的使用不仅限于海图；它还扩展到土地测量和地形图。工程师、建筑师和土地规划者利用chart datum确保其项目按照正确的规格和高程建造。例如，在建造建筑物或基础设施时，专业人员必须考虑chart datum以避免洪水并确保适当的排水。不准确的高程测量可能导致严重的结构问题和增加的成本。随着技术的不断进步，确定和使用chart datum的方法也在不断演变。随着GPS和卫星技术的出现，导航员现在可以获得比以往更精确的数据。这些进步允许实时更新和调整chart datum，提高了导航的安全性和效率。然而，用户仍然必须理解chart datum的基本原理，以便根据提供的数据做出明智的决策。总之，chart datum的概念是导航和制图的核心，作为测量水深和高程的基础参考。其重要性跨越多个领域，从海洋导航到土地测量，突显了准确和可靠数据的必要性。随着技术的进步，对chart datum的理解和应用将继续发展，但其在确保导航安全和精确方面的基本作用将保持不变。因此，参与这些领域的任何人都应掌握chart datum的重要性及其对工作的影响。